International Telecommunication Union
ITU-T
PSTN/ISDN Emulation
&
Simulation
Dr. Ghassem Koleyni
Nortel Networks
Tel: +1 613 763 4154
Fax: +1 613 765 6295
ghassem@nortel.com
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
Content
ITU-T
o
NGN and PSTN/ISDN
Emulation and simulation
Scenarios
Services and evolution
Related activities in ITU-T
o
Conclusion
o
o
o
o
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
2
NGN & PSTN/ ISDN
ITU-T
o Call server (CS)-based
•Equipment re-use
•Service continuity
o IP multimedia sub-system (IMS)-based
•Immediate migration
•Access to new services
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
3
NGN: CS-based
ITU-T
Call Server
PSTN
Cable, IAD, xDSL
Packet
Switched
Network
Private Lines
Wireless
AN
PABX
signalling
VoIP
ISDN
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
4
NGN: IMS-based
ITU-T
IMS
Packet
Switched
Network
Other
networks
signalling
VoIP
Other
networks
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
5
Emulation
ITU-T
Provision of PSTN/ISDN service
capabilities and interfaces using
adaptation to an IP
infrastructure.
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
6
Simulation
ITU-T
Provision of PSTN/ISDN-like service
capabilities using session control
over IP interfaces and
infrastructure
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
7
General architecture
ITU-T
Simulation
NGN
(Carrier Y)
PLMN
User equipment
User equipment
NNI
IWF
UNI
UNI
ADF1
NGN
(Carrier X)
UNI
User equipment
ADF1
ADF2
ADF2
UNI
IWF
IWF
User equipment
NNI
PSTN/ISDN
Public IP
Network, e.g.
SIP (non-IMS)
User equipment
UNI = User Network Interface = IF1
NNI = Network Node Interface = IF2
User equipment
Emulation
ADF= Adaptation Function
IWF=Interworking Function
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
8
Emulation scenario
ITU-T
UNI
UNI
ADF2
NGN
ADF2
User
equipment
User
equipment
o An encapsulation process
o All services available to PSTN/ISDN users
o User experience not changed by the network
transformation
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
9
Simulation scenarios - 1
ITU-T
UNI
UNI
NGN
User
equipment
User
equipment
o PSTN/ISDN-like services available
o Availability of possible new services
o User experience is changed by the
network transformation
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
10
Simulation scenarios - 2
ITU-T
UNI
UNI
NGN
ADF1
User
equipment
User
equipment
o Only PSTN/ISDN-like services available
o New experience for legacy terminal users
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
11
Emulation, simulation & interworking - 1
ITU-T
UNI
NNI
NGN
UNI
PSTN/ISDN
User
equipment
User
equipment
o Service interworking between NGN and
PSTN/ISDN is required
o Only PSTN/ISDN-like services available
o Legacy terminal user experience cannot be
fulfilled for end-to-end connection
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
12
Emulation, simulation & interworking - 2
ITU-T
NNI
UNI
NGN
UNI
IP network
User
equipment
User
equipment
o Service interworking between NGN and IP
network is required
o Both the NGN and IP network user experiences
may not be fulfilled for end-to-end connection
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
13
ISDN services
ITU-T
DDI
CT
CONF
MSN
CFB
3PTY
CLIP
CFNR
CUG
CLIR
CFU
PNP
COLP
CD
CRED
COLR
LH
AOC
MCI
CW
REV
SUB
HOLD
UUS
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
14
Additional legacy services
ITU-T
VPN
IN Services
Operator Services
LNP
Long Distance
Wireline & Wireless
Business
Residential
Continuity
Continuity of
of providing
providing services
services is
is essential
essential
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
15
Questions to ask
ITU-T
o Have all these services been universally used by
majority of the operators?
o Have all these services provided value to the
operators and the end users?
o Are there new services provided by NGN which are
as good as the old ones and some are new?
o Should care be taken in selecting services for
emulation or simulation?
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
16
Where are we now in ITU-T?
ITU-T
o Described emulation and simulation
o Many aspects related to emulation and
simulation have been considered
o Emulation and simulation scenarios
identified
o Requirements for public interest services
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
17
Future work
ITU-T
o Examine existing services and select
candidates for emulation and simulation
o Identify additional service capabilities
o Address OAM, management and control
& signalling aspects
o Identify protocols
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
18
Conclusion
ITU-T
o Substantial progress has been made in the
preparation of initial specifications
addressing evolution of networks to NGN
o Good progress on PSTN/ISDN emulation and
simulation
o More works needs to be done to complete
control and signalling aspects for PSTN/ISDN
evolution
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
19
List of Acronyms
ITU-T
AN
AOC
ATM
CCBS
CD
CFB
CFNR
CFU
CLIP
CLIR
COLP
COLR
CONF
CRED
CS
CT
CUG
CW
DDI
DSL
HOLD
IAD
Access Network
Advice of Charge
Asynchronous Transfer Mode
Completion of Calls to Busy
Subscriber
Call Deflection
Call Forwarding Busy
Call Forwarding No Reply
Call Forwarding Unconditional (CFU)
Calling Line Identification
Presentation
Calling Line Identification
Restriction
Connected Line Identification
Presentation
Connected Line Identification
Restriction
Conference Calling
Credit Card Calling
Call Server
Call Transfer (CT)
Closed User Group
Call Waiting
Direct-Dialling-In
Digital Subscriber Line
Call Hold
Integrated Access Device
IMS
IN
IP
ISDN
ISUP
IWF
IXC
LH
LNP
MCI
MLPP
MSC
MSN
PLMN
PNP
PSTN
QoS
REV
SIP
SIP-I
SUB
UUS
VoIP
VPN
3PTY
IP Multimedia Sub-system
Intelligent Network
Internet Protocol
Integrated Services Digital Network
ISDN User Part
Interworking Function
IntereXchange Carrier
Line Hunting
Local Number Portability
Malicious Call Identification
Multi-Level Precedence and
Preemption
Mobile Switching Centre
Multiple Subscriber Number
Public Land Mobile Network
Private Numbering Plan
Public Switched Network
Quality of Service
Reverse Charging
Session Initiation Protocol
Refers to Rec. Q.1912.5
Sub-addressing
User-to-User Signalling
Voice over IP
Virtual Private Network
Three Party Service
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
20
ITU-T
Thank you for your attention
ITU-T Workshop on “Next Generation Networks“
Hanoi, Vietnam, 15-16 May 2006
21