Telecommunications Recommendation
extension "B-2-1"
SPECIFICATION FOR
COMMON CHANNEL SIGNALLING SYSTEM No. 7
ISDN User Part
for national ISDN connections
/ISUP-N2/
Version_1
03/2005
Makedonski telekom AD – Skopje
Orce Nikolov bb, 1000 Skopje
ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Normative references:
-ETS 300 356: Signalling System No. 7 ISDN User Part Version 2 for the international interface.
- ETS 300 356-1 (1995): Basic services [ITU-T Rec. Q. 730 (1993), modified].
- ETS 300 356-2 (1995): ISDN supplementary services [ITU-T Rec. Q. 730 (1993), modified].
- ETS 300 356-3 (1995): Calling Line Identification Presentation (CLIP) supplementary service [ITU-T
Rec. Q. 731, clause 3 (1993), modified].
- ETS 300 356-4 (1995): Calling Line Identification Restriction (CLIR) supplementary service [ITU-T
Rec. Q. 731, clause 4 (1993), modified].
- ETS 300 356-5 (1995): Connected Line Identification Presentation (COLP) supplementary service
[ITU-T Rec. Q. 731, clause 5 (1993), modified].
- ETS 300 356-6 (1995): Connected Line Identification Restriction (COLR) supplementary service [ITU-T
Rec. Q. 731, clause 6 (1993), modified].
- ETS 300 356-7 (1995): Terminal Portability (TP) supplementary service [ITU-T Rec. Q. 733, clause 4
(1993), modified].
- ETS 300 356-8 (1995): User-to-User Signalling (UUS) supplementary service [ITU-T Rec. Q. 737,
clause 1 (1993), modified].
- ETS 300 356-9 (1995): Closed User Group (CUG) supplementary service [ITU-T Rec. Q. 735, clause 1
(1993), modified].
- ETS 300 356-10 (1995): Subaddressing (SUB) supplementary service [ITU-T Rec. Q. 731, clause 8
(1992), modified].
- ETS 300 356-11 (1995): Malicious Call Identification (MCID) supplementary service.
- ETS 300 356-12 (1995): Conference Call, add-on (CONF) supplementary service [ITU-T Rec. Q. 734,
clause 1 (1993), modified].
- ETS 300 356-14 (1995): Explicit Call Transfer (ECT) supplementary service.
- ETS 300 356-15 (1995): Diversion supplementary services [ITU-T Rec. Q. 732, clauses 2 to 5 (1993),
modified].
- ETS 300 356-16 (1995): Call Hold (HOLD) supplementary service [ITU-T Rec. Q. 733, clause 2
(1993), modified].
- ETS 300 356-17 (1995): Call Waiting (CW) supplementary service [ITU-T Rec. Q. 733, clause 1
(1992), modified].
- ETS 300 356-18 (1995): Completion of Calls to Busy Subscriber (CCBS) supplementary service.
- ETS 300 356-19 (1995): Three Party (3PTY) supplementary service [ITU-T Rec. Q. 734, clause 2
(1993), modified].
- EN 300 485v1.3.1.”Integrated Services Digital Network (ISDN).; Definition and usage of cause and
location in Digital Subscriber Signalling System No1 (DSS1) and Signalling System No7(SS7)ISDN
User Part (ISUP) [ITU –T Recommendation Q850 (05/98)with addendum (not yet published)
- ETS 300 403-1 (1995): Digital Subscriber Signalling System No. 1 (DSS 1); Part 1: Protocol
specification [ITU-T Rec. Q. 931 (1993), modified].
- ITU-T Rec. Q.850 (03/93): Usage of Cause and Location in the Digital Subscriber Signalling No. 1 and
the Signalling System No. 7 ISDN User Part
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Table of contents
This specification describes the requirements for the National ISDN User Part Version 2 (ISUP-N2) of
Signalling System No. 7, applicable to the interface of the national transit and local exchanges. The
objective of the specification is to provide a clear description of the ISDN User Part for the implementers
and the staff involved in tests, operation and maintenance. The specification is written in English in
order to align the description as close as possible to the terminology used in ETSI standards and ITU-T
Recommendations.
The text of this specification is based on the ETSI Standard ETS 300 356-XX. Where any
discrepancy exists between the requirements of this specification and any unreferenced part of the
documents (e.g. SDLs) then these requirements shall be deemed to modify those sections of the
documents.
In order to be as close as possible to the relevant ETSI standards, in this document only the
exceptions and clarifications to the Base document are described.
As ETS 300 356-XX Standards give the exceptions to ITU-T Recommendations Q. 761 to 764
and Q. 73X series, this document specifies only the added exceptions and clarifications. If otherwise not
clearly stated in a Clarification in this specification, the text of the ITU-T Recommendation shall be used
as modified by the referred ETSI standard. Those parts of the specifications which are marked as
"national option", "for national use", "reserved", "for further study" are in general not used unless stated
otherwise.
Starting with the next Chapter, the current numbering within the Chapters follows the numbering
scheme of the referenced standards.
All timer values shall be accurate to within + or - 5% of nominal values.
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
1 Basic services
Exceptions and Clarifications to
ETS 300 356-1 (1995): Signalling System No. 7 ISDN User Part Version 2 for the international interface;
Part 1: Basic services
Foreword
The text is accepted.
Scope
The text is accepted.
Normative references
The text is accepted.
Definitions
The text is accepted.
Abbreviations
The text is accepted.
Global modifications to ITU-T Recommendations Q. 761 to 764
The text is accepted.
Modifications to ITU-T Recommendation Q. 761
Shall apply with the following additional modifications:
Capabilities supported by the ISDN User Part
Clarification: Replace table 1/Q.761 by:
Function/service
Basic call
Speech/3.1 kHz audio
64 kbit/s unrestricted
Multi rate connection types (Note)
Signalling procedures for connection type allowing fallback capability
Compatibility procedure
Confusion procedure
Simple segmentation
Transit network selection
User part availability control
Propagation delay determination procedure
Dynamic echo control procedure
Tones and announcements
MTP pause and resume
Access delivery information
Transportation of User teleservice information
Generic signalling procedures for supplementary services
End-to-end signalling – Pass along method
End-to-end signalling – SCCP Connection Oriented
End-to-end signalling – SCCP Connectionless
Generic number transfer
Generic digit transfer
Generic notification procedure
Simple service activation procedure
Remote operations procedure
Network specific facility procedure
Supplementary services
Direct Dialling In (DDI)
Multiple Subscriber Number (MSN)
Calling Line Identification Presentation / Restriction (CLIP/CLIR)
Connected Line Identification Presentation / Restriction (COLP/COLR)
Malicious Call Identification (MCID)
(without the HOLD option)
Sub-addressing (SUB)
Terminal portability (TP)
Call forwarding (CFU, CFB, CFNR)
national
use
+
+
+
+
+
+
+
- Note3
- Note2
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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Call deflection (CD)
Call waiting (CW)
Call hold (HOLD)
Conference calling (CONF)
Three party service (3PTY)
Closed User Group (CUG)
Multilevel Precedence and Pre-emption (MLPP)
User-to-User Signalling (UUS), Service 1 (implicit)
User-to-User Signalling (UUS), Service 1 (explicit)
User-to-User Signalling (UUS), Service 2
User-to-User Signalling (UUS), Service 3
Explicit Call Transfer (ECT)
Call Completion to Busy Subscriber (CCBS)
Free phone (FPH)
Key:
+ Represents HTC support
- Represents HTC non-support
Note: Multi rate connection types are 2*64, 384, 1536 and 1920 kbit/s
+
+
+
+
+
+
+
+
-
Note2 : Static echo control as per Q.767 is supported.
Note3 : Propagation delay determination procedure is partially supported
Signalling methods
Two signalling methods are used in this Recommendation:
link-by-link method,
end-to-end.
The link-by-link method is primarily used for messages that need to be examined at each exchange (see
section 5). The end-to-end methods are used for messages of end point significance (see
Recommendation Q.730. 1992).
The link-by-link method may be used for messages of end point significance.
Only link-by-link method is used.
5
End-to-end signalling
Shall not apply.
6.2 Version Compatibility
Additional ITU-T national messages set recognized:
Charge information
Identification request
Identification response
Information
Information request
Loop back acknowledgement
Segmentation
Unequipped circuit identification code
User part available
User part test
Additional specific national messages set recognized
Delayed release
Charging acknowledgement
Charge band
Charging information
Charging pulse
Charge unit
Tariff change
False answer
A recognized message may be received containing a message compatibility information parameter.
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Normative references
In that case, the message compatibility information parameter is ignored and the (recognized) message
is processed as described in call control software.
Sent by, such an additional recognized message however contains the message compatibility
information parameter which value is set in accordance with the rules pertaining to the functions this
message relates to (in other words, the message compatibility information parameter is recreated).
When an unrecognized message is received, containing a message compatibility information parameter
and that following these compatibility instructions the unrecognized message has to be passed on, then
it is retransmitted containing a message compatibility information parameter which content is the same
as the received one.
Parameter set recognized on the national network.
This set comprises :
the ITU-T recommended minimum parameter set recognized at the international interface
(parameters numbered from 1 to 29),
an additional set of ITU-T parameters,
an additional set of national parameters referring to specific national procedures (e.g. charging).
Additional ITU-T parameters set recognized by:
Access delivery information
Call diversion information
Call history information
Freephone indicators
Generic notification
Generic number
Information indicators
Information request indicators
Location number
MCID request indicator
MCID response indicator
Message compatibility information
Parameter compatibility information
Propagation delay counter
Redirection number restriction
User teleservice information
Additional specific national parameters set recognized by an E10 implementation
Message number
Charge unit number
Charge band number
New charging information
Next charging information
Current charging information
A recognized parameter may be received with corresponding parameter compatibility information
instruction indicators.
In that case, the parameter compatibility information instruction indicators are ignored and the
(recognized) parameter is processed as described in call control software.
When such an additional recognized parameter is sent by, corresponding parameter compatibility
information instruction indicators may be inserted in a parameter compatibility information parameter,
the value of these indicators being set in accordance with the rules pertaining to the functions this
parameter relates to (in other words, the parameter compatibility information instruction indicators are
recreated).
When an unrecognized parameter is received accompanied by parameter compatibility information
instructions, and that following these compatibility instructions the unrecognized parameter has to be
passed on, then it is retransmitted accompagnied with parameter compatibility information instructions
which are the same as the received ones.
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Modifications to ITU-T Recommendation Q. 762
Shall apply with the following additional modifications:
1
Signalling messages
Clarifications:
The following definition shall be added:
1.50
trunk offer message (TKO): A message sent in forward direction indicating an operator's request
for trunk offering or other operator activity associated with it.
For the messages to be used please refer to 'Modifications to ITU-T Recommendation Q. 763'.
1.
GENERAL FUNCTION OF MESSAGES AND SIGNALS
GENERAL
This Recommendation describes the elements of signalling information used by the ISDN User Part
protocol and their function. The encoding of these elements, the format of the messages in which they
are conveyed and their application in the ISDN User Part signalling procedures are described in
Recommendations Q.763 and Q.764. Table 1/Q.762 gives the mandatory or optional parameters in the
ISDN user part messages and Table 2/Q.762 lists the abbreviations of these messages.
The Table 1/Q.762 is not included in the ITU-T Recommendation Q.762.
1.
Signalling messages
1.
Charge information message (CRG) (national use)
Information sent in either direction for accounting and/or call charging purposes.
A message sent in the backward direction indicating either implicit charging information during call setup phase or explicit charging units during call conversation phase.
1.
Circuit group query message (CQM) (national use)
Circuit group query message is not supported.
A message sent on a routine or demand basis to request the far-end exchange to give the state of all
circuits in particular range.
1.
Circuit group query response message (CQR) (national use)
Circuit group query response message is not supported.
A message sent in response to a circuit group query message to indicate the state of all circuits in a
particular range.
1.
Delayed release message (DRS) (national use) (not used in 1992 years Recommendation)
Delayed release message is supported.
A message sent in the forward direction indicating that the calling party has disconnected but that the
network is holding the connection.
1.
Facility accepted message (FAA)
A message sent in response to a facility request message indicating that the requested facility has been
invoked.
FAA message is never initiated.
1.
Facility message (FAC)
Facility message is not supported.
A message sent in either direction at any phase of the call to request an action at another exchange.
The message is also used to carry the results, error or rejection of a previously requested action.
1.
Facility request message (FAR)
A message sent from an exchange to another exchange to request activation of a facility.
FAR message is never initiated .
1.
Forward transfer message (FOT) (international use)
Forward transfer message is not supported.
1.
Identification request message (IDR)
A message sent in either direction to request an action regarding the malicious call identification
supplementary service.
1.
Identification response message (IRS)
A message sent in response to the identification request message.
When initiated by, this message is sent in the forward direction.
1.
Information message (INF) (national use)
A message sent to convey information in association with a call, which have been requested in an
information request message.
When initiated by, this message is sent in the forward direction.
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
1.
Information request message (INR) (national use)
A message sent by an exchange to request information in association with a call.
When initiated by, this message is sent in the backward direction.
1.
Loop back acknowledgement message (LPA) (national use)
A message sent in the backward direction in response to a continuity check request message indicating
that a loop (or transceiver in case of a 2-wire circuit) has been connected.
LPA message is never initiated.
1.
Loop prevention message (LOP)
A message sent in either direction when the loop prevention procedure is performed.
LOP message is not supported.
1.
Network resource management message (NRM)
Network resource management message is not supported.
1.
Overload message (OLM) (national use)
Overload message is not supported.
1.
Pass-along message (PAM) (national use)
Pass-along message is not supported.
1.
Unequipped circuit identification code message (UCIC) (national use) A message sent
from an exchange to another when it receives an unequipped circuit identification code.
UCIC message is never initiated.
1.
Additional national messages
1.
Charging acknowledgement message (CHA)
The charging acknowledgement message is sent forwards to acknowledge the correct reception of the
tariff change message or of the charge unit message.
1.
Charge band message (CHB)
Prior to the establishment of a call, the charge band message ensures the backward transmission of
implicit charging information from a charging controlling exchange to the originating subscriber
exchange or to an upstream ISDN exchange.
1.
Charging information message (CHG)
Prior to the establishment of a call, the charging information message enables the backward
transmission of explicit charging data from a charging controlling exchange to the originating subscriber
exchange or to an upstream ISDN exchange.
1.
Charging pulse message (CHP)
Message sent backwards to the preceeding exchange, each time charging units are applied downwards
to the communication. When charging is not performed in the local originating exchange, that message
can be sent on purpose from the hierarchical upper charging point, either systematically or depending
on specific calling party characteristics (e.g. coinbox, subscriber line with home meter device....).
1.
Charge unit message (CHU)
The charge unit message, sent backwards from a charging controlling exchange to the originating
subscriber exchange or to an upstream ISDN exchange provides the number of charging units to be
applied on its reception.
1.
Tariff change message (TAC)
The tariff change message is sent backwards from a charging controlling exchange to the originating
subscriber exchange or to an upstream ISDN exchange to indicate the subsequent tariff changes
occurring during a call.
1.
False answer message (FSA)
Message sent backwards in semi automatic traffic during the offering procedure to indicate to the
national operator that the analogue called subscriber line is in the on-hooking position and then can be
rung.
1.
Operator message (OPR)
OPR messages are sent forwards in semi automatic traffic from a national operator to an analogue
subscriber line during an offering procedure.
The OPR message can take 3 different meanings according to its position in the call sequence :
Start of offer (the operator enters as a third party in an existing conversation).
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
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End of offer (the operator withdraws from the 3-party conversation).
Ringing signal (the operator requests the called party to be rung after having accepted the operator offer
when on-hooking). This message can also be sent after the conversation phase between the 2 parties
when the operator wants to re-ring the called subscriber in on-hooking position.
The sequence "start of offer" "end of offer" can be repeated several successive times.
2
-
Signalling information
Clarifications:
The following definition shall be added:
2.156 charge band number: Information sent in backward direction to indicate the zone number to be
used for charging the call.
2.157 number of charging units: Information sent in backward direction to indicate the number of
charging units (meter pulses) to be sent.
For the signalling information to be used please refer to 'Modifications to ITU-T
Recommendation Q. 763'.
Table 2/Q.762
Clarification: The following message shall be added: TKO (Trunk offer).
Signalling information
1.
Address presentation restricted indicator
Information sent in either direction to indicate that the address information is not to be presented to a
public network user, but can be passed to another public network. It may be also used to indicate that
the address can not be ascertained.
In fact, the "Address not ascertained" coding is not part of the ITU-T "Address presentation restricted
indicators" codings.
It is the "Address not available" coding that is provided.
1.
Address signal
An element of information in a network number. The address signal may indicate digit values 0 to 9,
code 11 or code 12. One address signal value (ST) is reserved to indicate the end of the called party
number.
Code 13 and code 14 are added in relation with other national applications.
1.
Call identity (national use)
Call identity information is not supported.
************************
Information sent in the call reference parameter indicating the identity of a call in a signalling point.
1.
Call reference (national use)
Call reference parameter is not supported.
************************
Circuit independent information identifying a particular call.
1.
Call transfer number
Call transfer number parameter is not supported.
************************
The call transfer number parameter is used to exchange the remote party number of the users involved
in the transfered call.
1.
Call transfer reference
Call transfer reference parameter is not supported.
************************
The call transfer reference parameter is sent in the Loop prevention message in either direction and
contains an integer (0,....,255) expressed in pure binary allocated unambiguously to the particular ECT
service invocation.
1.
Calling party address response indicator (national use)
Information sent in response to a request for the calling party address, indicating whether the requested
address is included, not included or not available or incomplete.
The "incomplete" coding is not part of the ITU-T "Calling party address response indicator" codings.
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
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*********************
1.
Calling party number incomplete indicator
Information sent in the forward direction indicating that the complete calling party number is not
included.
The calling party number incomplete indicator indicates if the calling party number (address signals)
which is included in the parameter is complete or incomplete.
When no calling party is included, the address is declared as not available (refer to the address
presentation restricted indicator).
*********************
1.
Calling party's category
Information sent in the forward direction indicating the category of the calling party and, in case of semiautomatic calls, the service language to be spoken by the incoming, delay and assistance operators.
The codings relating to the service languages are unused (reserved for international use).
************************
1.
Charge information request indicator (national use)
Charge information request indicator is not supported.
************************
Information sent in either direction requesting charge information to be returned.
1.
Charge information response indicator (national use)
Charge information response indicator is not supported.
************************
Information sent in response to a request for charge information indicating whether or not the requested
information is included.
1.
Circuit state indicator (national use)
Circuit state indicator is not supported (as the circuit group query procedure is not supported).
************************
Information indicating the state of a circuit according to the sending exchange.
1.
Component type (national use)
Component type is not supported (as Remote Operations Service Element procedures are not
supported).
************************
1.
Connection request
Connection request parameter is not supported (as SCCP method of end-to-end signalling is not
supported).
************************
Information sent in the forward direction on behalf of the signalling connection control part requesting
the establishment of an end-to end connection.
1.
Credit (national use)
Credit information is not supported (as SCCP method of end-to-end signalling is not supported).
************************
Information sent in a connection request, indicating the window size requested by the signalling
connection control part for an end-to-end connection.
1.
Encoding scheme (National use)
Encoding scheme information is not supported (as the generic digits parameter is not supported).
************************
Information sent to indicate the coding type for the digit information, e.g. BCD-coded.
1.
Error code (national use)
Error code element is not supported (as Remote Operations Service Element procedures are not
supported).
************************
The Error Code element contains the reason why an operation cannot be completed successfully. It is
present only in a Return Error component. As with operations, errors may be local or global. These
errors and associated parameters are defined in relevant supplementary service specifications.
1.
Event indicator
Information sent in the backward direction indicating the type of event which caused a call progress
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message to be sent to the originating local exchange.
As the CPG message can be sent in any direction and the Event information parameter is mandatory in
the CPG message, the Event indicator may also be transmitted forwards to a destination exchange.
*********************
1.
Event presentation restricted indicator (national use)
Information sent in the backward direction indicating that the event should not be presented to the
calling party.
As the CPG message can be sent in any direction and the Event information parameter is mandatory in
the CPG message, the Event presentation restricted indicator may also be transmitted in the forward
direction indicating that the event should not be presented to the connected line.
*********************
1.
Facility indicator
Information sent in facility related messages identifying the facility or facilities with which the message is
concerned.
1.
Freephone indicators
Freephone indicator is not supported.
************************
Information sent in forward direction indicating whether the call is a freephone call or not.
1.
Generic digits (national use)
Generic digits parameter is not supported.
Note(s) :
In the generic digits parameter all the "Type of digits" codings are either specified as
reserved or spare. The use of this parameter is thus for further applications.
************************
Digit information, which is not suitable to be sent within numbering parameter, sent in either direction to
convey information between exchanges due to supplementary service.
1.
Feature code (national use)
Feature code information is not supported.
Note(s) :
In the service activation parameter all the features codes are specified as reserved. The
use of this information is thus for further applications.
************************
Information sent in either direction to invoke, accept, or reject a specific action for a supplementary
service.
1.
Incoming half echo control device request indicator
Incoming half echo control device request indicator is not supported (as the dynamic echo control
procedure is not supported).
************************
Information sent to request the activation or deactivation of an incoming half echo control device.
1.
Incoming half echo control device response indicator
Incoming half echo control device response indicator is not supported (as the dynamic echo control
procedure is not supported).
************************
Information sent to inform whether an incoming half echo control device has been included or not.
1.
Invoke ID (national use)
Invoke ID is not supported (as Remote Operations Service Element procedures are not supported).
************************
An Invoke ID is used as a reference number to identify uniquely an operation invocation. It is present in
the Invoke component and in any reply to the Invoke (Return Result, Return Error or Reject), enabling
the reply to be correlated with the invoke.
1.
Length of network identification (national use)
Length of network identification information is not supported.
************************
Information sent in the network specific facility parameter, to indicate the length in octets of the network
identification.
1.
Length of reference indicator (reserved)
Length of reference indicator information is not supported.
************************
Information sent in the generic reference parameter, to indicate the length in octets of the reference.
1.
Linked ID (national use)
Linked ID is not supported (as Remote Operations Service Element procedures are not supported).
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************************
A Linked ID is included in an Invoke component by a node when it responds to an operation invocation
with a linked operation invocation. The node receiving the Linked ID uses it for correlation purposes in
the same way that it uses the Invoke ID in Return Result, Return Error and Reject components.
1.
Local reference
Local reference is not supported (as SCCP method of end-to-end signalling is not supported).
************************
Information sent in the connection request, indicating the local reference allocated by the signalling
control part to an end-to-end connection.
1.
Look for busy (LFB) (National use)
Look for busy information is not supported (as the MLPP supplementary service is not supported).
************************
Information sent in the forward direction to indicate whether the LFB option is allowed or if the path for
the call is reserved.
1.
Loop prevention indicators
Loop prevention indicators are not supported.
************************
Information sent in the Loop prevention message in either direction in association with a request (or a
response to a request) when the loop prevention procedure is performed.
MLPP service domain information is not supported (as the MLPP supplementary service is not
supported).
************************
Information sent in the forward direction to identify the specific MLPP service domain subscribed by the
calling user.
1.
MLPP user indicator (National use)
MLPP user indicator is not supported (as the MLPP supplementary service is not supported).
************************
Information sent in the backward direction to indicate that the called user is an MLPP user.
1.
Network identification plan (national use)
Network identification plan information is not supported (as the transit network selection parameter is
not supported).
************************
Information sent to indicate the identification plan for identifying the network, e.g. X.121 or E.212, (DNIC
or MNIC).
1.
Network identification (national use)
Network identification information is not supported (as the transit network selection parameter is not
supported).
************************
Information sent to identify a network.
1.
Network identity (national use)
Network identity information is not supported (as the MLPP precedence parameter is not supported).
************************
Information sent to identify the network who administrates the supplementary service.
1.
Network specific facilities (national use)
Network specific facilities parameter is not supported.
************************
Service related information transparently transferred in either direction between the local exchange and
the identified network which contracts the service. The information is significant to both user and the
identified network.
Information sent in association with a generic number, qualifying the number that is transferred, e.g. a
network specific number or a number related to a specific supplementary service.
1.
Operation code (national use)
Operation code element is not supported (as Remote Operations Service Element procedures are not
supported).
************************
1.
Origination ISC point code
Originating International Switching Centre (ISC) point code parameter is not supported.
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************************
Information sent in the initial address message of an international call, indicating the point code of the
originating ISC.
1.
Outgoing half echo control device request indicator
Outgoing half echo control device request indicator is not supported (as the dynamic echo control
procedure is not supported).
************************
Information sent to request the activation or deactivation of an outgoing half echo control device.
1.
Outgoing half echo control device response indicator
Outgoing half echo control device response indicator is not supported (as the dynamic echo control
procedure is not supported).
************************
Information sent to inform whether an outgoing half echo control device has been included or not.
1.
Point code
Point code information is not supported (as SCCP method of end-to-end signalling is not supported).
************************
Information sent in the connection request parameter identifying the signalling point at which connection
request originated.
1.
Precedence level (National use)
Precedence level information is not supported (as the MLPP supplementary service is not supported).
************************
Information sent in the forward direction to indicate the priority of the call.
1.
Problem code (national use)
Problem code element is not supported (as Remote Operations Service Element procedures are not
supported).
************************
1.
Protocol class
Protocol class information is not supported (as SCCP method of end-to-end signalling is not supported).
************************
Information sent in the connection request parameter indicating the protocol class requested by the
signalling connection control part for the end-to-end connection.
1.
Protocol profile (national use)
Protocol profile information is not supported (as Remote Operations Service Element procedures are
not supported).
************************
Information sent in either direction to indicate the protocol used in the Remote Operations parameter.
1.
Redirection number restriction indicator
Information sent in the backward direction indicating whether the diverted-to user allows the
presentation of his number.
In Recommendation Q.763, the Redirection number restriction information is not specified as an
indicator. This information is specified as a parameter containing a Presentation restricted indicator.
*********************
1.
Reference nth octet (reserved)
Reference nth octet information is not supported.
************************
Information sent in the generic reference parameter, expressing the reference number of the context
given by the entity which handles and provides the service.
1.
Reference qualifier indicator (reserved)
Reference qualifier indicator is not supported.
************************
Information sent in the generic reference parameter, identifying the context which handles and provides
the service.
1.
Remote operations (national use)
Remote operations parameter is not supported (as Remote Operations Service Element procedures are
not supported).
************************
The remote operations parameter is used to indicate the invocation of a supplementary service
identified by an operation value and also carry the result or error indications depending on the outcome
of the operation.
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
1.
Sequence (national use)
Sequence Tag is not supported (as Remote Operations Service Element procedures are not supported).
************************
The sequence is an ordered set.
1.
Service activation parameter
Service activation parameter is not supported.
************************
Information sent in either direction to indicate the invocation, acceptance or rejection of supplementary
services, when no service associated parameter is to be sent.
1.
Set (national use)
Set element is not supported (as Remote Operations Service Element procedures are not supported).
************************
The set element is used to contain a set of information elements accompanying a component. It is
required in the case of more than one information elements being included in a component. The
information elements themselves are defined in relevant supplementary service specifications.
1.
Signalling point code (national use)
Signalling point code parameter is not supported.
************************
Information sent in a release message to identify the signalling point in which the call failed.
1.
Temporary trunk blocking after release (national use)
Temporary trunk blocking after release is not supported (as the temporary trunk blocking (TTB)
procedure is not supported).
************************
Information sent to the exchange at the other end of a circuit (trunk) to indicate low level of congestion
at the sending exchange and that the circuit (trunk) should not be re-occupied by the receiving
exchange for a short period of time after release.
TTB information is not explicit information (e.g. a parameter, an indicator). This information is implicitly
delivered by the overload message.
*********************
1.
Transit network selection (national use)
Transit network selection parameter is not supported.
************************
Information sent in the initial address message indicating the transit network(s) requested to be used in
the call.
1.
Transmission medium requirement prime
Transmission medium requirement prime parameter is not supported.
************************
Information sent in the forward direction indicating the fallback connection type in case of fallback.
1.
Transmission medium used
Transmission medium used parameter is not supported.
************************
Information sent in the backward direction indicating a resulting fallback connection type used for a call
after fallback has occurred.
1.
Type indicator
Information sent to indicate the initiator for a circuit group supervision message, e.g. maintenance
oriented or hardware failure oriented.
A better description of the Type indicator is given hereafter:
Information sent by the initiator to indicate the type of blocking/unblocking in a circuit group
blocking/unblocking supervision message, e.g. maintenance oriented or hardware failure oriented.
*********************
1.
Type of digits (national use)
Type of digits information (generic digits parameter) is not supported.
************************
Information sent in association with a generic digit to indicate the type of digit, e.g. authorization code.
1.
Type of network identification (national use)
Type of network identification information (transit network selection parameter) is not supported.
Information sent to inform whether the identification of a network is by CCITT standardization
identification or by national network identification.
1.
User service information prime
“B-2-1” 14 / 35
ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
User service information prime parameter is not supported.
Information sent in the forward direction indicating the additional bearer capability requested by the
calling party.
1.
Additional national parameters
1.
Tariff indicator
The tariff indicator provides the basic charge coefficient to apply in a periodic-charging procedure.
1.
Tariff factor
The tariff factor is a number which, when multiplied by the basic charge coefficient indicated by the tariff
indicator, gives the real charging period (in seconds).
1.
Time indicator
The time indicator gives the time at which the next change of charging will occur.
1.
Charge unit number
Information sent to the outgoing subscriber exchange which indicates the number of charge units to be
recorded on the calling subscriber's meter.
1.
Message number
This information allows the checking of in-sequence reception of several charge unit messages relating
to the same call.
1.
Packet charging
Packet charging, sent backwards, indicates the number of charging units to apply either upon answer or
connect message reception.
1.
Current charging information
Sent backwards, the current charging information provides the charging data to be applied upon
reception of the answer or connect message.
1.
Next charging information
Sent backwards, the next charging information provides the charging data to be applied at the time
indicated by the time indicator.
1.
New charging information
Sent backwards, the new charging information provides the new charging period to be applied at the
time indicated by the time indicator.
1.
Charge band number
The charge band number allows the receiving exchange (the exchange which elaborates charging) to
retrieve in its own tables the corresponding explicit charging data (i.e., packet charging, charging period,
charging switchover time).
Table A-2/Q.762 - ISDN user part message acronyms
Acronym
Message
ACM
Address complete
ANM
Answer
BLA
Blocking acknowledgement
BLO
Blocking
CCR
Continuity check request
CFN
Confusion
CGB
Circuit group blocking
CGBA
Circuit group blocking acknowledgement
CGU
Circuit group unblocking
CGUA
Circuit group unblocking acknowledgement
CON
Connect
COT
Continuity
CPG
Call progress
CRG
Charge information
CQM
Circuit group query
CQR
Circuit group query response
DRS
Delayed release
FAA
Facility accepted
FAC
Facility
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
FAR
FOT
FRJ
GRA
GRS
IAM
IDR
IRS
INF
INR
LOP
LPA
NRM
OLM
Facility request
Forward transfer
Facility reject
Circuit group reset acknowledgement
Circuit group reset
Initial address
Identification request
Identification response
Information
Information request
Loop prevention
Loop back acknowledgement
Network resource management
Overload
Table A-2/Q.762 - ISDN user part message acronyms (continued)
Acronym
Message
PAM
Pass along
REL
Release
RES
Resume
RLC
Release complete
RSC
Reset circuit
SAM
Subsequent address
SGM
Segmentation
SUS
Suspend
UBL
Unblocking
UBA
Unblocking acknowledgement
UCIC
Unequipped circuit identification code
UPA
User part available
UPT
User part test
USR
User-to-user information
Acronyms of the additional national messages
Acronym
Message
CHA
Charging acknowledgement message
CHB
Charge band message
CHG
Charging information message
CHP
Charging pulse message
CHU
Charge unit message
TAC
Tariff change message
FSA
False answer message
OPR
Operator message
************************
Modifications to ITU-T Recommendation Q. 763
Shall apply with the following additional modifications:
In the national application, the four spare bits are unused : they are coded "0" (zero) on transmission,
and are ignored in reception.
Multiple 64 kbit/s connection type calls are not supported.
2.1
Message type codes
Clarifications:
The following message type code shall be added: Trunk offer (Code: 1111 1111).
The following messages shall be used:
Address complete
Answer
Blocking
Blocking acknowledgement
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Call progress
Circuit group blocking
Circuit group blocking acknowledgement
Circuit group reset
Circuit group reset acknowledgement
Circuit group unblocking
Circuit group unblocking acknowledgement
Charge information
Confusion
Connect
Continuity
Continuity check request
Facility
Facility accepted
Facility reject
Facility request
Forward transfer
Identification request1
Identification response
Information
Information request
Initial address
Loop prevention
Release
Release complete
Reset circuit
Resume
Segmentation
Subsequent address
Suspend
Trunk offer
Unblocking
Unblocking acknowledgement
User Part available
User Part test
User-to-user information
Any other message will never be sent, and if received it shall be treated according to
2.9.5.2/Q.764.
3
ISDN User Part parameters
3.1
Parameter names
Clarifications:
The following parameter type codes shall be added:
Charge band number (Code: 1111 1111)
Number of charging units (Code: 1111 1110).
3.2 to 3.61 Description of the parameters
Clarifications:
The following parameter value shall be added to the Calling party's category parameter:
1111 1110
Intelligent Network call
-
The following parameters shall be added:
3.AA Charge band number
The format of the Charge band number parameter field is shown below:
8
7
6
5
4
3
2
1
Charge band number
The following codes are used in the charge band number parameter field:
00000000
No charge
00000001
to > Binary representation of the charge band number to be applied
1
This message is never sent according to this specification.
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
11111111
3.AB Number of charging units
The format of the Meter pulse number parameter field is shown below:
8
7
6
5
4
3
2
1
Number of charging units
The following codes are used in the charge band number parameter field:
00000000
spare
00000001
to > Binary representation of the number of charging units to be sent
11111111
-
The following parameters and parameter values shall be used:
Access delivery information
message generated
Access transport
Automatic congestion level
level 1 exceeded
Access delivery indicator
no set-up
set-up message generated
Access transport
as defined in Q.931
Automatic congestion level congestion
congestion level 2 exceeded
Charge indicator
no indication
no charge
charge
Called party’s status indicator
no indication
subscriber free
Called party’s category ind.
no indication
ordinary subscriber
payphone
End-to-end method indicator
no end-to-end method available
Interworking indicator
no interworking encountered
interworking encountered
End-to-end information ind.
no end-to-end information available
ISDN User Part indicator
ISDN User Part not used all the way
ISDN User Part used all the way
Holding indicator
holding not requested
holding requested
ISDN access indicator
terminating access non-ISDN
terminating access ISDN
Echo control device indicator
IC half echo control dev. not included
IC half echo control device included
SCCP method indicator
no indication
Call diversion information
Notification subscr. option unknown
presentation not allowed
pres. allowed with redirection number
pres. allowed without redirection nr
Redirection reason
unknown
user busy
no reply
unconditional
deflection during alerting
deflection immediate response
mobile subscriber not reachable
Call history information
The call history information parameter
is pure binary representation the propagation delay value of a call in ms.
Call transfer number
as of 'Calling part number' not supported
Call transfer reference
Call transfer reference
any value not
supported
Called party number
Odd/even indicator even number of
address signals
odd number of address signals
Nature of address
subscriber number
national (significant) number
international number
network routing number concatenated
Backward call indicators
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
with Called
Internal network number ind.
DN(8)
routing to INN allowed
routing to INN not allowed
Numbering plan indicator
ISDN/Telephony numbering plan
Address signal
digit 0
to
digit 9
code 11
code 12
ST
Filler
as required(In case of an odd number of
address
signals ,the filter code 0000 is inserted after the last address signal)
Calling party number
Odd/even indicator as of 'Called party
number'
Nature of address indicator
as of 'Called party number'
Calling party number inc. ind
complete
incomplete
When sending the calling party number parameter, if the calling party number incomplete indicator is set
to ‘incomplete’, then the nature of address indicator is set to ‘national (significant) number.
When receiving the calling party number parameter, if the calling party number incomplete indicator is
set to ‘incomplete’, then no check is performed on the nature of address indicator (i.e. all the values of
the nature of address indicator are accepted).
Numbering plan indicator
Address presentation restr. ind presentation allowed
as of 'Called party number'
presentation restricted
address not available
When the address presentation restricted indicator indicates address not available, the screening
indicator (item f)) is coded "network provided".
Screening indicator
user provided, verified and passed
network provided
User provided, verified and passed" and
"network provided" codes can be initiated by E10 system.
Address signal
as of 'Called party number'
Filler
as required(In case of an odd number of
address signals ,the filter code 0000 is inserted after the last address signal)
Calling party’s category
language French
Calling party’s category
operator,
operator, language English
operator, language German
operator, language Russian
operator, language Spanish
national operator (0000 1001)
ordinary subscriber
subscriber with priority
data call (voice band data)
test call
payphone
Intelligent Network call (1111 1110)
The following Calling party's categories are introduced:
"national operator with offer facility" (coding according to above ITU-T note).
This coding is set when the call is initiated by a national operator.
"calling subscriber with home metering or advice of charge" (coding in the range reserved for
national use).
This coding is set when the analogue user owns a home (charging) metering device or when
the ISDN user has subscribed to the advice of charge during call conversation phase (AOC-D)
supplementary service and/or to the advice of charge at the end of the call(AOC-E) supplementary
service.
"calling subscriber with remote immediate charge indication" (coding in the range reserved for
national use).
This coding is set when the user (ISDN or analogue) requires by using a special prefix before
his numbering, the immediate charge indication to the charging intermediate exchange.
"interception service" (coding in the range reserved for national use).
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
This coding is set when the call is initiated by an interception operator.
Cause indicators
1 standard (including
CCBS parameter
Charge band number
Circuit group supervision
type ind.
Circuit state indicator
Closed user group interlock
code
Connected number
number'
Nature of address indicator
Numbering plan indicator
Address presentation restr. ind as of 'Calling party number'
Screening indicator
Address signal
Filler
Connection request
Continuity indicators
Echo control information
End of optional parameters
optional parameters
All fields
As defined in EN 300 485v1.3.
Addendum 1, ITU Q.850)
CCBS call indicator no indication
CCBS call
Charge band number
any pattern
Type indicator
maintenance oriented
hardware failure oriented
not supported
Any field
any pattern
Odd/even indicator as of 'Called party
as of 'Called party number'
as of 'Called party number'
as of 'Calling party number'
as of 'Called party number'
as required
not supported
Continuity indicator continuity check failed
continuity check successful
not supported
End of optional parameters End of
The last optional parameter field of a
message is followed by the end of optional parameters indicator, which occupies a one octet field
containing all zeros.
Event information
Event indicator
alerting
progress
in-band info/pattern is now available
call forwarded on busy
call forwarded on no reply
call forwarded unconditional
Event presentation restr. ind.
no indication
When the event information parameter is
initiated, the event presentation restricted indicator is always set to 0”no indication”
In reception, bit H is handled with the “no
indication” meaning even if bit H is received set to the value “presentation restricted”
Facility indicator
Facility indicators user-to-user service
Forward call indicators
National/international call ind.
call to
be treated as a national call
call to be treated as an internat. call
End-to-end method indicator
as of 'Backward call indicators'
Interworking indicator
as of 'Backward call indicators'
End-to-end information ind.
as of 'Backward call indicators'
ISDN User Part indicator
as of 'Backward call indicators'
ISDN User Part preference ind. ISDN user part preferred all the way
ISDN user part not required
ISDN user part required all the way
ISDN access indicator
originating access non-ISDN
originating access ISDN
SCCP method indicator
as of 'Backward call indicators' no
indication
Generic Digits
not supported
Generic notification
Extension indicator information continues
in the next octet
last octet
Notification indicator
user suspended
user resumed
conference established
conference disconnected
other party added
“B-2-1” 20 / 35
ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Generic number
called number
isolated
reattached
other party isolated
other party reattached
other party split
other party disconnected
conference floating
call is a waiting call
call transfer, alerting
call transfer, active
remote hold
remote retrieval
call is diverting
Number qualifier indicator
additional
additional connected number
additional calling party number
additional original called number
additional redirecting number
additional redirection number
called freephone number
Odd/even indicator as of 'Called party
number'
Nature of address indicator
Number incomplete
Numbering plan indicator
Address presentation restr. ind as of 'Calling part number'
Screening indicator
Address signal
Filler
Generic Reference
Information indicators
party address not available
as of 'Called party number'
as of 'Calling part number'
as of 'Called party number'
user provided, not verified
user provided, verified and passed
user provided, verified and failed
network provided
as of 'Called party number'
as required
not supported
Calling party address resp. ind. calling
calling part address included
hold not provided
hold provided
Calling party's category resp. ind. calling party's category not incl.
calling party’s category included
Charge information resp. ind.
charge information not included
Solicited information indicator solicited
Information request indicators
Calling party address req. ind.
calling
party address requested
calling party address not required
Holding indicator
holding not requested
holding requested
Calling party's category req. ind. calling party's category not reqd
calling party’s category requested
Charge information request ind. charge information not requested
Malicious call iden. req. ind.
malicious call identification requested
malicious call identification not
requested
Location number
Odd/even indicator as of 'Called party
number'
Nature of address indicator
as of 'Called party number'
Internal network number ind.
as of 'Called party number'
Numbering plan indicator
as of 'Called party number'
Address presentation restr. ind as of 'Calling party number'
Screening indicator
as of 'Calling party number'
Address signal
as of 'Called party number'
Filler
as required
Loop prevention indicators
not supported
Type
request
Hold provided indicator
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Response indicator
MCID request indicators
requested
Holding indicator
MCID response indicators
included
Hold provided indicator
Message compatibility info
interpretation
Release call indicator
Send notification indicator
Discard message indicator
Pass on not possible indicator
Extension indicator
MLPP Precedence
Nature of connection indicators Satellite indicator
Continuity check indicator
Echo control device indicator
Network specific facility
Number of charging units
Optional backward call ind.
indication
response
insufficient information
no loop exists
simultaneous transfer
MCID request indicator
MCID
MCID not requested
Holding not requested
Holding requested
MCID response indicator
MCID not
MCID included
Hold not provided
Holding provided
Transit at intermediate node ind. transit
end node interpretation
do not release call
release call
do not send notification
send notification
do not discard message (pass on)
discard message
release call
discard information
last octet
not supported
no satellite circuit in the connection
one satellite circuit in the connection
two satellite circuit in the connection
continuity check not required
continuity check reqd on this circuit
cont. check perfd on previous circuit
OG half echo control dev. not incl.
OG half echo control device included
not supported
Number of charging units any pattern
In-band information indicator
no
in-band information/pattern available
no indication
call forwarding may occur
Simple segmentation indicator no additional info will be sent
additional info will be sent in a SGM
MLPP user indicator
no indication
Optional forward call ind.
Closed user group call ind. non-CUG call
CUG call, OG access allowed
CUG call, OG access not allowed
Simple segmentation indicator as of 'Optional backward call ind.'
Connected line id. req ind
not requested
requested
Original called number
Odd/even indicator as of 'Called party
number'
Nature of address indicator
as of 'Called party number'
Internal network number ind.
as of 'Called party number'
Numbering plan indicator
as of 'Called party number'
Address presentation restr. ind as of 'Calling party number'
Address signal
as of 'Called party number'
Filler
as required
Origination ISC Point Code
not supported
th
Parameter compatibility info
N upgraded parameter name as
required
Transit at intermediate node ind. transit interpretation
end node interpretation
Release call indicator
do not release call
Call diversion may occur ind.
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
release call
do not send notification
send notification
Discard message indicator
do not discard message (pass on)
discard message
Discard parameter indicator
do not discard parameter (pass on)
discard parameter
Pass on not possible indicator
release call
discard message
discard parameter
Extension indicator
next octet exist
last octet
Propagation delay counter
The propagation delay counter
parameter expresses in pure binary representation the propagation delay value of a call in ms to be
accumulated during call set up.
Range and status
Range ant pattern
a)
Range
A number in pure binary representation ranging from 1 to 255. The number represented by the
range code +1 indicates the range of circuits affected by the message.
b)
Status
The status subfield contains from 2 to 256 status bits numbered from 0 to 255. Status bit 0 is
located in bit position 1 of the first status subfield octet. Other status bits follow in numerical order. The
number of relevant status bits in a given status subfield is equal to range +1.
Each status bit is associated with a circuit identification code such that status bit n is associated
with circuit identification code m+n, where m is the circuit identification code contained in the message.
The status bits are coded as follows :
in circuit group blocking messages
0
no indication
1
blocking
in circuit group blocking acknowledgement messages
0
no indication
Send notification indicator
1
-
-
in circuit group unblocking messages
0
no indication
1
unblocking
in circuit group unblocking acknowledgement messages
0
no indication
1
-
blocking acknowledgement
unblocking acknowledgement
in circuit group reset acknowledgement messages
0
not blocked for maintenance reasons
1
blocked for maintenance reasons
The number of circuits affected by a group supervision message is limited to 32 or less. For the
group reset messages this requires that the range value be 31 or less. For the group blocking and
unblocking messages the range value may be up to 255, but the number of status bits set to 1 must be
32 or less.
For the group blocking, unblocking and reset messages, range code 0 is reserved.
Status
Redirecting number
number'
Nature of address indicator
Internal network number ind.
Numbering plan indicator
Address presentation restr. ind as of 'Calling party number'
Address signal
Filler
Redirection information
any pattern
Odd/even indicator as of 'Called party
as of 'Called party number'
as of 'Called party number'
as of 'Called party number'
as of 'Called party number'
as required
Redirecting indicator
no redirection
call rerouted
call rerouted all redirection information
presentation restricted
call diversion
call diversion, all info restricted
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
call rerouted, redirection number
presentation restricted
call diversion, redir. number restrd
Original redirection reason
Redirection counter
Redirecting reason
Redirection number
number'
Nature of address indicator
Internal network number ind.
Numbering plan indicator
Address presentation restr. ind as of 'Calling party number'
Address signal
Filler
Redirection number restriction
allowed
Remote operations
Service activation
supported
Signalling point code
not supported
Subsequent number
number'
Address signal
Filler
Suspend/resume indicators
subscriber initiated
Transit network selection
number
unknown/not available
user busy
no reply
unconditional
001 to 101
unknown/not available
user busy
no reply
unconditional
deflection during alerting
deflection immediate response
mobile subscriber not reachable
Odd/even indicator as of 'Called party
as of 'Called party number'
as of 'Called party number'
as of 'Called party number'
as of 'Called party number'
as required
Presentation restricted ind. presentation
presentation restricted
not supported
Feature code
call transfer not
Signalling point code
any pattern
Odd/even indicator as of 'Called party
as of 'Called party number'
as required
Suspend/resume indicator ISDN
network initiated
odd/even indicator as of Called Party
Type of network identification
national network identification
Network Identification plan 0(zero)
Network identification
Network
identification
Transmission medium req
Transmission medium req speech
64 kbit/s unrestricted
3.1 kHz audio
64 kbit/s preferred
2×64 kbit/s unrestricted
384 kbit/s unrestricted
1920 kbit/s unrestricted
Transmission medium req prime Transm. medium req prime
speech not supported
64 kbit/s unrestricted
3.1 kHz audio
Transmission medium used
All fields
as of transmission medium
req. not supported
User service information
All fields
according to Q.931
User service information prime
All fields
according to Q.931 not
supported
User teleservice information
All fields
according to Q.931
User-to-user indicators, request type
Service 1 / 2 / 3
no information
request, not essential
request, essential
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
response type
no information
not provided
provided
Network discard indicator
UUI discarded by the network
User-to-user information
Service 1 / 2 / 3
no indication
any pattern
Any other parameters or parameter values not listed above will never be sent, and if
received it shall be treated according to 2.9.5.2/Q.764.
1.
National parameters
1.
Current charging information
Format of the current charging information parameter :
8
7
6
5
Packet charging
Tariff indicator
Tariff factor
FIGURE 3.N1 - Current charging information parameter field
1)
4
3
2
1
2
1
spare
Packet charging :
00000000
to
packet charging coding
00001111
00010000
to
spare
11111111
2)
3)
1.
Tariff indicator :
00000000
00000001
00000010
00000011
00000100
00000101
00000110
00000111
00001000
to
00001111
00010000
to
11111111
charging coefficient 0 : flat rate charge
charging coefficient 1 : 0.05 second
charging coefficient 2 : 0.1 second
charging coefficient 3 : 0.2 second
charging coefficient 4 : 0.5 second
charging coefficient 5 : 1.0 second
charging coefficient 6 : 2.0 seconds
charging coefficient 7 : 4.0 seconds
00000000
00000001
to
11111111
spare
spare
reserved for future
Tariff factor :
tariff factor coding
Next charging information
Format of the next charging information parameter:
8
7
6
5
Time indicator
Packet charging
Tariff indicator
Tariff factor
FIGURE 3.N2 - Next charging information parameter field
4
3
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
1)
Time indicator :
00 000 00
00 000 01
00 000 10
00 000 11
00 001 00
00 001 01
00 001 10
...
10 111 11
11 000 00
11 000 01
to
11 111 11
2)
3)
4)
immediate tariff change
00 hr. 15
00 hr. 30
00 hr. 45
01 hr. 00
01 hr. 15
01 hr. 30
23 hr. 45
24 hr. 00
spare
Packet charging :
refer to current charging information parameter
Tariff indicator :
refer to current charging information parameter
Tariff factor :
refer to current charging information parameter
1.
New charging information
Format of the new charging information parameter:
8
7
6
5
Time indicator
Tariff indicator
Tariff factor
FIGURE 3.N3 - New charging information parameter field
1)
2)
3)
4
3
2
1
spare
4
3
2
1
3
2
1
3
2
1
Time indicator :
refer to next charging information parameter
Tariff indicator :
refer to current charging information parameter
Tariff factor :
refer to current charging information parameter
1.
Charge band number
Format of the charge band number:
8
7
6
Charge band number
FIGURE 3.N4 - Charge band number parameter field
00000000
to
11111111
charge band number coding
1.
Charge unit number
Format of the charge unit number parameter :
8
7
6
Charge unit number
FIGURE 3.N5 - Charge unit number parameter field
00000000
00000001
to
11111111
5
5
4
spare
charge unit number coding
1.
Message number
Format of the message number parameter:
8
7
6
Message number
FIGURE 3.N6 - Message number parameter field
00000000
spare
5
4
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
00000001
to
11111111
4
message number coding
ISDN User Part messages and codes
Table 24/Q.763: Circuit group query response not supported
TABLE 25/Q.763 - Message Type : Circuit group reset acknowledgement
Parameter
Reference
Type
Length
Implem.
(subclause)
(octets)
Message type
2.1
F
1
F
Range and status
3.43
V
3-34
V
When sent by E10 exchange, the length of the range and status field is 3-6 octets since 32 circuits at
most are concerned.
TABLE 26/Q.763 - Message Type : Confusion
Parameter
Reference
(subclause)
Message type
2.1
Cause indicators
3.12
End of optional parameters
3.20
Type
F
V
O
The correct length for the Cause indicators parameter is 3-?.
TABLE 27/Q.763 - Message Type : Connect
Parameter
Reference
Type
(subclause)
Message type
2.1
F
Backward call indicators
3.5
F
Optional backward call indicators
3.37
O
Connected number
3.16
O
Call reference @
3.8
O
User-to-user indicators
3.60
O
User-to-user information
3.61
O
Access transport
3.3
O
Network specific facility @
3.36
O
Generic notification ind. (Note)
3.25
O
Remote operations @
3.48
O
Transmission medium used
3.56
O
Echo control information
3.19
O
Access delivery information
3.2
O
Call history information
3.7
O
Parameter compatibility information
3.41
O
Redirection number
3.46
O
Service activation
3.49
O
Generic number (Note)
3.26
O
Redirection number restr.
3.47
O
End of optional parameters
3.20
O
Note(s) :
This parameter may be repeated.
The correct length of the Call history information parameter is 4.
TABLE 29/Q.763 - Message Type : Facility reject
Parameter
Reference
Type
(subclause)
Message type
2.1
F
Length
(octets)
1
4-20
1
Length
(octets)
1
2
3
4-12
7
3
3-131
3-?
4-?
3
3-?
3
3
3
3
4-?
5-12
3-?
5-13
3
1
Length
(octets)
1
Implem.
F
V
O
Implem.
F
F
O
O
O
O
O
O
O
O
O
O
O
O
O
Implem.
F
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Facility indicator
Cause indicators
User-to-user indicators
End of optional parameters
3.22
3.12
3.60
3.20
F
V
O
O
1
4
3
1
F
V
O
O
The Cause indicators parameter should have a length (octets) of 3-?.
Clarification to Table 30/Q.763: The format of the Information message is:
TABLE 30 Message type: Information
Parameter name
Reference
Type
Length
Message type
2.1
F
1
Information indicators
F
2
Calling party number
3.28
O
4-12
End of optional parameters
3.10
O
1
3.20
Clarification to table 31/Q.763: The format of the Information request message is:
TABLE 31 Message type: Information Request
Parameter name
Reference
Type
Length
Message type
2.1
F
1
Information request indicators
3.29
F
2
TABLE 34/Q.763 - Message Type : Release complete
Parameter
Reference
(subclause)
Message type
2.1
Cause indicators
3.12
End of optional parameters
3.20
Type
F
O
O
Length
(octets)
1
5-6
1
Implem.
F
O
O
The Cause indicators parameter should have a length (octets) of 4-?
TABLE 37/Q.763 - Message Type : Forward transfer not supported
TABLE 39/Q.763 Message Type : Blocking - Blocking acknowledgement - Continuity check
request - Loop back acknowledgement @ - Overload @ - Reset circuit - Unblocking - Unblocking
acknowledgement - Unequipped circuit identification code @
Parameter
Reference
Type
Length
Implem.
(subclause)
(octets)
Message type
2.1
F
1
F
Overload message is not supported.
TABLE 41/Q.763 - Message Type : Circuit group reset a) - Circuit group query a) not supported
TABLE 43/Q.763 - Message Type : Pass-along not supported
TABLE 45/Q.763 - Message Type : Facility
Facility message is not supported
TABLE 46/Q.763 - Message Type : Network resource management not supported
TABLE 47/Q.763 - Message Type : Identification request
Parameter
Reference
Type
Length
Implem.
(subclause)
(octets)
Message type
2.1
F
1
F
MCID request indicators
3.31
O
3-?
O
Message compatibility information
3.33
O
3-?
O
Parameter compatibility information
3.41
O
4-?
O
End of optional parameter
3.20
O
1
O
The correct length (octets) of the MCID request indicators parameter is 3.
TABLE 48/Q.763 - Message Type : Identification response
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Parameter
Reference
Type
Length
(subclause)
(octets)
Message type
2.1
F
1
MCID response indicator
3.32
O
3-?
Message compatibility information
3.33
O
3-?
Parameter compatibility information
3.41
O
4-?
Calling party number
3.10
O
4-12
Access transport
3.3
O
3-?
Generic number (Note)
3.26
O
5-13
End of optional parameter
3.20
O
1
Note(s) :
This parameter may be repeated.
The correct length (octets) of the MCID response indicators parameter is 3.
1.
Implem.
F
O
O
O
O
O
O
O
NATIONAL MESSAGES
TABLE N1 - Message Type : Charge information message (CRG)
Parameter
Type
Message type
F
Charge band number
O
Charge unit number
O
Message compatibility information
O
End of optional parameters
O
Length (octets)
1
3
3
3
1
TABLE N2 - Message Type : Charging information message (CHG)
Parameter
Type
Message type
F
Current charging information
O
Next charging information
O
End of optional parameters
O
Length (octets)
1
5
6
1
TABLE N3 - Message Type : Tariff change message (TAC)
Parameter
Message type
New charging information
End of optional parameters
Type
F
F
O
Length (octets)
1
3
1
TABLE N4 - Message Type : Charge band message (CHB)
Parameter
Message type
Charge band number
End of optional parameters
Type
F
F
O
Length (octets)
1
1
1
TABLE N5 - Message Type : Charge unit message (CHU)
Parameter
Message type
Charge unit number
Message number
End of optional parameters
Type
F
F
F
O
Length (octets)
1
1
1
1
TABLE N6 - Message Type : Charging acknowledgement message (CHA)
Parameter
Type Length (octets)
Message type
F
1
End of optional parameters
O
1
TABLE N7 - Message Type : Charging pulse message (CHP)
Parameter
Type
Length (octets)
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
Message type
Charge unit number
End of optional parameters
F
O
O
1
3
1
TABLE N8 Message Type : Messages related to operators - Operator message (OPR) - False
answer message (FSA)
Parameter
Type Length (octets)
Message type
F
1
Message compatibility information
O
3
End of optional parameters
O
1
TABLE N9. - Message Type : Delayed release
Parameter
Type
Message type
Call reference @
End of optional parameters
F
O
O
Length
(octets)
1
7
1
Implem.
F
O
Clarification (general): The following messages shall be added:
TABLE AA Message type: Trunk offer
Parameter name
Message type
Reference
2.1
TABLE AB Message type: Charge information
Parameter name
Reference
Message type
2.1
Charge band number
3.AA
Number of charging units
3.AB
Message compatibility
3.33
information
3.41
Parameter compatibility
3.20
information
End of optional parameters
Type
F
Type
F
O
O
O
O
O
Length
1
Length
1
3
3
3
4
1
Annex A: Interpretation of spare codes
Clarification to 3.13 (Circuit supervision message type indicator) of Table A2/Q.763: Type
indicator: in case of receiving unrecognized parameter value of this field, the message is discarded and
a Confusion message is sent with cause value 110. Reserved bits H-C: the information is ignored.
Clarification to 3.35 (Nature of connection indicators), Satellite indicator of Table A3/Q.763: In
case of receiving unrecognized parameter value of this field, Confusion message is not sent.
Modifications to ITU-T Recommendation Q. 764
Shall apply with the following additional modifications:
2
Basic call control and signalling procedures
2.1
Successful call setup
2.1.1
Forward address signalling - En-bloc operation
2.1.1.1 Actions required at the originating exchange
Clarification to item a): The selection of the outgoing route will also depend on the calling party's
category.
Clarification to item b): On national calls, the address information may be the local number or
the national number as well.
Clarification to item c): The originating or interworking exchange always sends the calling party
number. If it is not available, the appropriate indication is sent.
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Normative references
The call reference and SCCP connection request parameters are not used.
Clarification to item d): Through connection of the transmission path will be completed in the
forward direction after receiving the Answer or Connect Message.
2.1.1.2 Actions required at an intermediate national exchange
Clarification to item a): The selection of the outgoing route will also depend on the calling party's
category. The user service information and the user teleservice information is not used for routing
purposes. The transmission medium requirement parameter is not modified.
2.1.1.3 Actions required at an outgoing international exchange
Clarification to item a): As of 2.1.1.2.a).
Clarification to item b): If the received calling party number is not in international number format,
then it is converted to international number (i.e. country/trunk code is added) and the nature of address
is set to "international number".
2.1.1.4 Actions required at an intermediate international exchange
Clarification to item a): As of 2.1.1.2.a).
2.1.1.5 Actions required at an incoming international exchange
Clarification to item a): As of 2.1.1.2.a).
Clarification to item b): As of 2.1.1.3.b). The incoming international exchange deletes the
originating ISC point code parameter from the Initial Address Message.
Clarification to item c): As of 2.1.1.1.d).
2.1.1.6 Actions required at the destination exchange
Clarification to item a): The selection of the called party will also depend on the calling party's
category.
2.1.2
Forward address signalling - Overlap operation
Clarifications: As of 2.1.1.
Clarification to 2.1.2.1 item d): Through connection of the transmission path in the backward
direction at the originating exchange will be completed immediately after sending the Initial Address
Message.
2.1.3
Calling party number
Clarification: The calling party number is always included in the initial address message. If the
number is not available, the appropriate indication ("address not available") is sent. The calling party
number is requested only if it was not included in the initial address message (e.g. in case of
interworking with exchanges using an earlier version of ISUP).
2.1.4
Address complete message, connect message and call progress message
Clarification to item 2.1.4.2 and 2.1.4.4: The Awaiting Answer Timer (T9) is not used in the
intermediate national and intermediate international exchanges.
Clarification to item 2.1.4.6.b): In case of test calls, the Awaiting Answer Timer (T9) is not
started.
2.1.6
Information messages
Clarification: This function is used for Malicious call identification purpose. If the MCID service is
activated (or appropriate indication is received in an interworking exchange) and no calling party number
parameter is included in the Initial address message, the calling party number is requested by sending
an Information request message (calling party address requested, malicious call identification
requested) backward.
2.1.9
Charging
Clarifications:
Basically the originating local exchange is the charge controlling exchange, and it determines
the charging depending on the called party number. In some circumstances (e.g. IN call, international
calls) it is necessary to send charging information from the succeeding exchange. This is done via the
Charge information (CRG) message. In case of IN call, the SSP (Service Switching Point) generates the
CRG message based on the received information from the SCP.
If no Charge information message is received, the originally stored charging program applies. If
a Charge band number parameter is received in the Charge information message during the call setup
(before the answer), the message is stored in the exchange. If more than one Charge information
messages are received, the latest one will be valid. On receipt of the ANM message charging based on
the received charge band number is started in the originating local exchange, or meter pulses are
“B-2-1” 31 / 35
ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
generated in an interworking exchange.
If a Charge band number parameter is received in the active phase of a call, charging activities
related to the charge band number in use are immediately terminated. The charging activities are
resumed applying the new charge band number.
If a Number of charging units parameter is received in the active phase of a call, the charging
units are applied (added) in the originating local exchange, or additional meter pulses are sent in the
R2-N interworking exchange.
2.1.10 Transit network selection
Clarification: Shall apply
2.1.13 Trunk offering (MT specific requirement)
The Trunk offer message (TKO) is used to handle the calls originated by a long distance
operator. A call to a free subscriber is set up as a normal call without any special message. When the
called party is busy but available to the operator, the operator can offer the long distance call by sending
a TKO message.
If the calling party is an operator, the response is an Address Complete message with In-band
info indication, cause value 17 (subscriber busy) and a busy tone from the called exchange to the
operator (instead of Release message). If the trunk offer is not possible, a Release message with cause
value 42 (switching equipment congestion) is sent. When the operator has informed the subscriber that
a call is waiting, the operator can escape from the call by sending a repeated TKO message.
When the called party (to whom the operator wishes to offer a call) becomes free with his
handset off-hook (i.e. the partner goes on-hook), an Answer message is sent, and the conversation
begins, as shown below:
+-----------+
+-----------+
¦ Operator ¦
¦Destination¦
¦
¦
¦ exchange ¦
+-----------+
+-----------+
¦
¦
¦------------IAM------------->¦ called subscriber
¦
¦ busy
¦<---------ACM+IBI------------¦
¦
¦
¦------------TKO------------->¦ operator access
¦
¦
¦<<=========================>>¦
¦
trunk offering
¦
¦
¦
¦------------TKO------------->¦ operator escapes
¦
¦
¦<-----------ANM--------------¦ subscr. becomes free
¦
¦ with off-hook (answer)
¦
¦
¦<<=========================>>¦
¦
conversation
¦
When the called party becomes free with his handset on-hook, a Resume (network generated)
message followed within one second by a Suspend (network generated) message is sent to the
operator, who may start ringing by sending a TKO message. When the called party answers, an Answer
message is sent. The procedure is shown below.
+-----------+
+-----------+
¦ Operator ¦
¦Destination¦
¦
¦
¦ exchange ¦
+-----------+
+-----------+
¦
¦
¦------------IAM------------->¦ called subscriber
¦
¦ busy
¦<---------ACM+IBI------------¦
¦
¦
¦------------TKO------------->¦ operator access
¦
¦
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
¦<<=========================>>¦
¦
trunk offering
¦
¦
¦
¦------------TKO------------->¦ operator escapes
¦
¦
¦<-----------RES--------------¦ subscr. becomes
¦<-----------SUS--------------¦ free with on hook
¦
¦
¦------------TKO------------->¦ ringing
¦
¦
¦<-----------ANM--------------¦ subscriber
¦
¦ answers
¦<<=========================>>¦
¦
conversation
¦
If the called party becomes free (either on-hook, or off hook) before receiving the second TKO,
the appropriate indication (ANM or RES+SUS) is withheld until the second TKO.
It is also possible to offer a call after a SUS (network generated) message (i.e. called party onhook, T6 is running) in all cases.
2.2
Unsuccessful call set-up
Clarification to item 2.2.3: The exchange initiating a release procedure has the controlling
function.
2.3
Normal call release
Clarification: 2.3.1 item d) also applies.
2.5
Suspend, resume
Clarification: The call originating exchange has the controlling function.
2.6
Propagation delay determination procedure
Clarification: This function is not used.
2.7
Echo control procedure
Clarification: Dynamic echo control procedure is not used. For the echo control, the static echo
control is used according to ITU-T Rec. Q.767 as follows2:
General
The echo control procedure is used on a per call basis to convey information between exchange nodes
about the demand and ability to insert echo control devices. The procedure is invoked when a call is to
be routed on a connection for which echo control is necessary. It could be initiated at the originating
exchange or at an intermediate exchange.
Forward direction, actions at the originating exchange
If an originating exchange has sufficient information to determine that echo control is necessary for the
outgoing circuit, then an outgoing half echo control device is enabled; and the echo control device
indicator of the nature of connection indicators parameter field in the IAM is set.
Forward direction, actions at an intermediate exchange
If an intermediate exchange has sufficient information to determine that echo control is required for the
outgoing circuit, then one of the following actions can occur:
a)
When the nature of connection indicators parameter field in the IAM indicates that an echo
control device is already included, then no change to the nature of connection indicators parameter field
in the IAM is made, an incoming half echo control device is reserved, and any outgoing half echo control
device is disabled.
b)
When the nature of connection indicators parameters in the IAM does not indicate that an echo
control device is already included, then an outgoing half echo control device is enabled; and the echo
control device indicator in the nature of connection indicators parameter field is set.
If the intermediate exchange has sufficient information to determine that echo control is not required
for the outgoing circuit, then one of the following actions can occur:
a)
When the nature of connection indicators parameter field in the IAM indicates that an echo
control device is already included, then no change to the nature of connection indicators parameter field
in the IAM is made; and an incoming half echo control device is reserved.
b)
When the nature of connection indicator parameter field in the IAM does not indicate that an
2
Echo control procedure normally is performed only in the International Gateway Exchanges and in PLMNs.
“B-2-1” 33 / 35
ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
echo control device is already included, then no additional action is required.
Backward direction, actions at the destination exchange
Upon the receipt of an IAM with the indication "outgoing half echo control device included" in the nature
of connection indicators parameter field, then an incoming half echo control device is enabled; and the
echo control device indicator of the backward call indicators parameter field in the first backward
message (i.e. ACM or connect or call progress) is set. If the destination exchange is unable to include
an incoming half echo control device, the information is conveyed to the preceding exchange by an
echo control device indicator in the backward call indicators parameter field in the first backward
message.
Backward direction, actions at an intermediate exchange
Upon receipt of the first backward message (i.e. ACM or connect or call progress) in response to an IAM
with echo control indication, then one of the following actions can occur:
a)
When the backward call indicators parameter field indicates that an incoming half echo control
device is not already included, then the reserved incoming half echo control device is included, and the
echo control device indicator in the backward call indicators parameter field is set.
b)
When the backward call indicators parameter field indicates that an incoming half echo control
device is already included, then the reserved incoming half echo control is released, and no change to
the backward call indicators parameter field in the backward message is made.
2.8.3
Circuit group query
Clarification: This function is not used.
2.9.1
Dual seizure
Clarification to item 2.9.1.3 Method 1: The exchange with lower signalling point code will start
the selection from the lowest CIC and the other starts from the highest.
2.9.9
Temporary trunk blocking after release
Clarification: This function is not used.
TABLE A1/Q.764: Timers used in the ISDN User Part
Clarification:
T6 = 90 sec (default value)
T9 = 90 sec (default value)
Annex ZA: Coding of the compatibility information for basic calls
Clarifications: Add the following coding to the list:
ZA.1.1.2
a)
bit
bit
bit
bit
bit
b)
Instruction indicators
A:
Transit at intermediate exchange indicator
0
transit interpretation
B:
Release call indicator
1
release call
C:
Send notification indicator
1
send notification
D:
Discard message indicator
X
don't care
E:
Pass on not possible indicator
X
don't care
Extension indicator
1
last octet
ZA.1.2.3
a)
b)
bit
bit
bit
Charge information
Charge band number
Nth upgraded parameter
1111 1111
Charge band number
Instruction indicators
A:
Transit at intermediate exchange indicator
0
transit interpretation
B:
Release call indicator
1
release call
C:
Send notification indicator
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ISDN USER PART VERSION 2 FOR THE NATIONAL INTERFACE (ISUP-N2)
Normative references
1
D:
X
E:
X
GF:
XX
bit
bit
bit
b)
Extension indicator
1
last octet
ZA.1.2.4
a)
send notification
Discard message indicator
don't care
Discard parameter indicator
don't care
Pass on not possible indicator
don't care
Number of charging units
Nth upgraded parameter
1111 1110
Number of charging units
b)
Instruction indicators
A:
Transit at intermediate exchange indicator
0
transit interpretation
B:
Release call indicator
1
release call
C:
Send notification indicator
1
send notification
D:
Discard message indicator
X
don't care
E:
Discard parameter indicator
X
don't care
GF:
Pass on not possible indicator
XX
don't care
b)
Extension indicator
1
last octet
bit
bit
bit
bit
bit
bit
“B-2-1” 35 / 35