I NTERNATIONAL T ELECOMMUNICATION U NION
Telecommunication
Standardization Bureau
Geneva, 11 August 2000
Ref:
TSB Circular 282
COM 16/FB
Tel:
Fax:
+41 22 730 5860
+41 22 730 5853
- To the Administrations of Member States
of the Union
Copy:
- To ITU-T Sector Members;
- To the Chairman and Vice-Chairmen of
Study Group 16;
- To the Director of the Telecommunication
Development Bureau;
- To the Director of the Radiocommunication
Bureau
Subject:
Meeting of Study Group 16 with a view to approving two
corrigenda, one amendment, nine draft revised and
25 draft new Recommendations in accordance with the
provisions of Resolution 1, Section 8, of the WTSC
(Geneva, 1996)
Geneva, 17 November 2000
Dear Sir/Madam,
1
At the request of the Chairman of Study Group 16, Multimedia Services and Systems, I
have the honour to inform you that this Study Group, which will meet from 13 to
17 November 2000, intends to apply the procedure described in Resolution 1, Section 8, of the
WTSC (Geneva, 1996) for the approval of two corrigenda, one amendment, nine draft revised and
25 draft new Recommendations.
2
The summaries and locations of the draft revised ITU-T Recommendations and draft new
ITU-T Recommendations proposed for approval will be found in Annex 1.
3
Any ITU Member or Sector Member aware of a patent held by itself or others which may
fully or partly cover elements of the draft Recommendations proposed for approval is requested to
disclose such information to the TSB, in accordance with TSB patent policy (see Annex 1 of TSB
Circular 245 of 2 February 2000).
Available patent information can be accessed on-line via the ITU-T Website.
Place des Nations
CH-1211 Geneva 20
Switzerland
Telephone
+41 22 730 51 11
Telefax Gr3: +41 22 733 72 56
Gr4: +41 22 730 65 00
Telex 421 000 uit ch
Telegram ITU GENEVE
Internet: itumail@itu.int
X.400
S=itumail; P=itu
A=400net; C=ch
-2-
4
Having regard to the provisions of Resolution 1, Section 8, I should be grateful if you
would inform me by 2400 hours UTC on 1 November 2000 whether your Administration assigns
authority to Study Group 16 that these draft revised or new Recommendations should be considered
for approval at the Study Group meeting.
Should any Member States be of the opinion that consideration for approval should not
proceed, they should advise their reasons for disapproving and indicate the possible changes that
would facilitate further consideration and approval of the draft revised or new Recommendations.
5
If 70% or more of the replies from Member States support consideration for approval of
these draft revised or new Recommendations at the Study Group meeting, one Plenary session will
be devoted on 17 November 2000 to apply the approval procedure.
I accordingly invite your Administration to send a representative to the meeting. The
Administrations of Member States of the Union are invited to supply the name of the Head of
their delegation. If your Administration wishes to be represented at the meeting by a recognized
operating agency, a scientific or industrial organization or another entity dealing with
telecommunication matters, the Director should be duly informed, in accordance with Article 19,
No. 239, of the Convention of the International Telecommunication Union (Geneva, 1992), as
amended by the Plenipotentiary Conference (Minneapolis, 1998).
6
The agenda, registration form and all relevant information concerning the Study Group 16
meeting will be available from Collective-letter 10/16.
7
Information on the meeting room will be displayed on the screens at the entrances to the
ITU headquarters building.
8
After the meeting, the Director of TSB will notify, in a circular, the decision taken on these
Recommendations. This information will also be published in the ITU Notification.
Yours faithfully,
H. Zhao
Director of the Telecommunication
Standardization Bureau
Annex: 1
-3-
ANNEX 1
(to TSB Circular 282)
Summaries and location of the ITU-T Recommendations for
approval at the meeting of Study Group 16
(Geneva, 13 to 17 November 2000)
1
Draft revised ITU-T Recommendation V.18 – Operating and interworking requirements
for DCEs operating in text telephone mode (published in COM 16-125)
This Recommendation specifies features to be incorporated in DCEs intended for use in, or
communicating with, text telephones primarily used by the deaf and hard of hearing. One of
the goals of this Recommendation is to provide a platform on which a universal text telephone
can be built. To accommodate this goal, procedures for interworking with identified existing
text telephones are provided in clause 5. In addition, this Recommendation has the goal of
identifying ways in which the multimedia Recommendations could be used to support new
modes of operation or create new multi-mode text telephone devices. To accommodate this
additional goal, clause 6 identifies some possible uses of this technology to support text
telephony and additionally specifies requirements for multi-mode text telephone devices.
To provide for maximum flexibility, it is envisaged that any of the text telephone modes of
operation specified in this Recommendation will be invoked on an as required basis using the
commands specified in Recommendation V.250 or some equivalent mechanism.
It provides for:
• calling identification signals;
• no DCE-initiated disconnect;
• procedures for call establishment;
• procedures for interoperation with existing text telephones;
• specification of requirements for the use of text telephones in a multimedia environment.
2
Draft revised ITU-T Recommendation V.8 - Procedures for starting sessions of data
transmission over the public switched telephone network (published in COM 16-R76)
This Recommendation defines signals to be exchanged between DCEs over the PSTN when a
session of data transmission needs to be established, but before signals are exchanged which
are specific to a particular Recommendation. It provides means to automatically determine the
best available operational mode between two DCEs connected via the PSTN, provides a
timely indication to Circuit Multiplication Equipments on the V-series modulation to be
employed in a new session of data transmission, provides a means to enable a PSTN call to be
passed on automatically to an appropriate DCE, and provides signals for interacting with
PSTN echo-control equipment.
This Recommendation was revised in 1998 and 1999 to define additional call function types,
define procedures for the exchange of non-standard facilities information, and add support for
PCM modulation modes.
This Recommendation was revised in 2000 to provide support for V.92 features, correct errors
in the 1999 version, clarify the use of the prot0 octet, and add Section 10 to address
compatibility with future revisions of the Recommendation.
-4-
3
Recommendation V.8 bis - Procedures for the identification and selection of common
modes of operation between data circuit-terminating equipments (DCES) and between
data terminal equipments (DTES) over the public switched telephone network and on
leased point-to-point telephone-type circuits (published in COM16-R76)
This Recommendation defines signals, messages and the procedures for exchanging these
over the PSTN and on leased point-to-point telephone-type circuits, for the identification
and selection of common modes of operation between Data Circuit-terminating Equipments
(DCEs) and Data Terminal Equipments (DTEs). These are used when the modes of
operation of DCEs and DTEs communicating over the connection need to be automatically
established and selected, but before signals are exchanged which are specific to a particular
Recommendation. Considerations are included for the standard analogue telephony mode of
operation.
Revision 2 of this Recommendation adds support for PCM Modems, as described in
Recommendations V.90, V.91, and V.92.
4
Draft new ITU-T Recommendation V.44 - Data Compression Procedures (published
in COM16-R77)
Recommendation V.44 describes a data compression algorithm for use in DCEs. It achieves
a better performance than V.42 bis on many types of data. In addition to the normal stream
method, the algorithm has a packet method, which can compress data already contained in
frames in an efficient way.
5
Draft new ITU-T Recommendation V.59 - Managed Objects for Diagnostic
Information of Public Switched Telephone Network Connected V-Series Modem
DCE’S (published in COM16-R77)
This Recommendation specifies a series of Modem Managed Objects (MMO) that can be
used for modem diagnostics across standardized interfaces.
6
Draft new ITU-T Recommendation V.92 – Enhancements to Recommendation V.90
(published in COM16-R77)
Digital and analogue modems for use on the Public Switched Telephone Network (PSTN) at
data signalling rates up to 56000 bit/s downstream and up to 48000 bit/s upstream, with
reduced start-up time on recognised connections, and procedures to support modem-on-hold
in response to call-waiting events or outgoing call requests.
7
Draft revised Annex A.3 to ITU-T Recommendation F.700 Framework
Recommendation For Audiovisual/Multimedia Services (published in COM16-R67)
8
Draft new Annex C.2 to ITU-T Recommendation F.700 Middleware service elements
descriptions (published in COM16-R67)
9
Draft new ITU-T Recommendation F.701 – Guideline Recommendation for identifying
multimedia service requirements (published in COM16-R67)
This Recommendation provides guidelines for describing user requirements that are to be
used as the basis for constructing new multimedia services. These guidelines are primarily
intended to support the Multimedia service development methodology described in ITU-T
Recommendation F.700. However, they can also be used as the basis for a structured dialogue
between End-Users and Service Providers in order to arrive at a responsive service solution
when applicable service Recommendations are not yet available.
-5-
10
Draft new ITU-T Recommendation F.703 – Multimedia Conversational Services
(published in COM16-R67)
The purpose of this recommendation is to define the Generic Multimedia Conversational
Service and to describe their general features, regardless of the network environment in which
these services are provided. These services allow conversational communication between two
users in two different locations. The Generic Multimedia Conversational Services are one of
the generic service types identified in Recommendation F.700, and their description follows
the methodology described therein. The user requirements for the various applications
supported by the service are translated into generic service specifications, independent of the
constraints of specific implementations. Thus this Recommendation sets out the requirements
that will satisfy the users' needs and allow proper intercommunication on an international
basis of services offered by different providers and of equipments from different
manufacturers.
Various instances (profiles) of this generic service are considered here with a network
independent view. Specific service descriptions for each network will be issued in other
recommendations. The detailed technical specifications of the terminal, network and protocol
aspects for each of them are described in dedicated recommendations of the H.200, H.300,
H.400 series.
Along with the F.700 methodology, the description relies on the media components and the
communication tasks described respectively in Annexes A and B of Recommendation F.700.
These are service independent modular communication capabilities.
11
Draft revised ITU-T Recommendation H.323 (Version 4) – Packet-Based Multimedia
Communications Systems (published in COM 16-128)
This Recommendation covers the technical requirements for multimedia communications
systems in those situations where the underlying transport is a Packet Based Network (PBN)
which may not provide a guaranteed Quality of Service (QOS). These packet based networks
may include Local Area Networks, Enterprise Area Networks, Metropolitan Area Networks,
Intra-Networks, and Inter-Networks (including the Internet). They also include dial up
connections or point-to-point connections over the GSTN or ISDN which use an underlying
packet based transport such as PPP. These networks may consist of a single network segment,
or they may have complex topologies which incorporate many network segments
interconnected by other communications links.
This Recommendation describes the components of an H.323 system. This includes
Terminals, Gateways, Gatekeepers, Multipoint Controllers, Multipoint Processors, and
Multipoint Control Units. Control messages and procedures within this Recommendation
define how these components communicate. Detailed descriptions of these components are
contained in clause 6.
12
Draft new Annex J to ITU-T Recommendation H.323- Security for H.323 Annex F
(published in COM 16-116)
This annex describes security for H.323 Annex F simple endpoint types. The specified
security profile is based upon recommendation H.235v2 and uses the featured baseline
security profile of H.235 Annex D. The shown security profile in H.323 Annex J adopts
recommendation H.235 for the purpose of simple endpoint types and their specific security
requirements. The security profile selects appropriate security features from H.235 with its
rich set of options.
The described text provides an overview on the security profile; H.235v2 Annex D provides
all the technical and implementations details.
-6-
Basically, a security simple endpoint type (security SET) is a SET as defined by H.323
Annex F that implements additionally certain security features of this annex.
Currently, this annex focuses only on a “secure audio SET (SASET)” and leaves any other
security simple endpoint types (e.g.; secure FAX SET, secure text terminal, secure Video SET
etc) for further study.
This annex closes the open issue of security for SETs that was left for further study in chapter
8 of H.323 Annex F.
13
Draft new Annex K to ITU-T Recommendation H.323 - HTTP based service control
transport channel in H.323 (published in COM 16-127)
The purpose of this annex is to describe an optional way of controlling supplementary
services in an H.323 environment. By opening a separate HTTP connection for service
control, new services may be developed and deployed without updates to the H.323
endpoints.
This Annex works with H.323 and H.225.0 versions 4.
14
Draft new Annex L to ITU-T Recommendation H.323 - Stimulus Protocol (published in
COM 16-141)
H.323 Annex L describes stimulus signalling procedures between H.323 terminals and a
Feature Server functional entity. Standard H.225.0 signalling is used for basic call control. An
example of such terminals is a LAN attached feature phone.
The H.323 stimulus protocol allows services to be provided by one or more feature servers. A
Feature Server may be co-located with the Gatekeeper. The protocol described by this
document can support both the direct signalling model and the Gatekeeper routed model.
The stimulus method allows the network service provider to implement new supplementary
services for the terminals without changes in the terminal software, which results in easier
maintenance.
15
Draft new Annex M.1 to Recommendation H.323 - Tunnelling of Signalling Protocol
(Qsig) in H.323 (published in COM 16-118)
The purpose of this annex is to give guidance on tunnelling QSIG over H.323 networks.
This Annex requires H.323 and H.225.0 versions 4 or later. Version 4 products can be
identified by H.225.0 messages containing a protocolIdentifier = {itu-t (0) recommendation
(0) h (8) 2250 version (0) 4} and H.245 messages containing a protocolIdentifier = {itu-t (0)
recommendation (0) h (8) 245 version (0) 6}.
16
Draft new Annex M.2 to Recommendation H.323 - Tunneling of Signalling Protocol
(Isup) in H.323 (published in COM 16-129)
The purpose of this annex is to give guidance on tunnelling ISUP over H.323 networks.
This Annex requires H.323 and H.225.0 versions 4 or later. Version 4 products can be
identified by H.225.0 messages containing a protocolIdentifier = {itu-t (0) recommendation
(0) h (8) 2250 version (0) 4} and H.245 messages containing a protocolIdentifier = {itu-t (0)
recommendation (0) h (8) 245 version (0) 6}.
17
Draft New Annex H to ITU-T Recommendation H.324 – Mobile Multilink Operation
(published in COM 16-119)
This Annex defines the operation of H.324 over up to 8 independent physical connections,
aggregated together according to the mobile multilink layer defined in this Annex to provide a
higher total bit rate. These connections are error prone mobile channels as defined in Annex
C/H.324 all having the same transmission rate.
-7-
The difference between Annex H and Annex F is that Annex H is primarily intended to be
used on error prone connections by not using HDLC framing and with less flexibility in terms
of the number, the bit rate, and the delay differences of the channels involved in the
aggregation than Annex F in order to work on mobile connections. Annex H is not intended to
be a replacement of Annex F on connections with very low bit error rates.
18
Draft revised ITU-T Recommendation H.225.0 (Version 4) - Call Signalling Protocols
And Media Stream Packetization For Packet-Based Multimedia Communication
Systems (published in COM 16-134)
This Recommendation covers the technical requirements for narrow-band visual telephone
services defined in H.200/AV.120-series Recommendations, in those situations where the
transmission path includes one or more packet-based networks, each of which is configured
and managed to provide a non-guaranteed Quality of Service (QOS) which is not equivalent
to that of N-ISDN such that additional protection or recovery mechanisms beyond those
mandated by Recommendation H.320 need be provided in the terminals. It is noted that
Recommendation H.322 addresses the use of some other LANs which are able to provide the
underlying performance not assumed by the H.323/H.225.0 Recommendations.
This Recommendation describes how audio, video, data, and control information on a packetbased network can be managed to provide conversational services in H.323 equipment.
Products claiming compliance with Version 4 of H.225.0 shall comply with all of the
mandatory requirements of this Recommendation. Version 4 products can be identified by
H.225.0 messages containing a protocolIdentifier value of {itu-t (0) recommendation (0) h
(8) 2250 version (0) 4}.
19
Draft revised ITU-T Recommendation H.235 – Security and encryption for H-series
(H.323 and other H.245-based) multimedia terminals (published in COM 16-122)
The primary purpose of this Recommendation is to provide for authentication, privacy, and
integrity within the current H-Series protocol framework. The current text of this
Recommendation (2000) provides details on implementation with Recommendation H.323.
This framework is expected to operate in conjunction with other H-Series protocols that
utilize Recommendation H.245 as their control protocol.
20
Draft revised Recommendation H.245 – (Version 7) – Control Protocol For Multimedia
Communication (published in COM 16-120)
This Recommendation specifies syntax and semantics of terminal information messages as
well as procedures to use them for in-band negotiation at the start of or during
communication. The messages cover receiving and transmitting capabilities as well as mode
preference from the receiving end, logical channel signalling, and Control & Indication.
Acknowledged signalling procedures are specified to ensure reliable audiovisual and data
communication.
21
Draft new Annex E.1 to ITU-T Recommendation H.246 – General Inter-Working
Function (IWF) Between Mobile Application Part and H.225.0
(published in COM 16-137)
The purpose of this annex is to introduce the mechanisms to enable current Mobile
Subscribers to access mobile networks using an H.323 terminal and obtain the same Mobile
Services they get from a Public Land Mobile Network (PLMN) Mobile Terminal.
 PLMN mobile subscribers without H.323_UIM Terminal cannot use regular H.323 terminals to
access and use the services provided by PLMN mobile networks with same mobile phone number.
Such services include Call Delivery with Caller Identification, Call Origination, Call Termination,
Message Waiting Notification, Short Message Services etc.
-8 The solution is to define an Inter-working function (IWF) between H.323 network and PLMN
networks (such as ANSI-41, GSM, and PDC networks). Defining the extension of H.323 terminal
protocols and procedures to allow the support of User Identification Module (UIM) or User
Identification Information for various PLMN mobile networks.
 This proposal does not require any changes in the Public Land Mobile Networks.
H.246 Annex E.2 describes the inter-working between ANSI-41 Mobile Application Part
(MAP of North American Signalling System number 7) and H.225.0 Multimedia Call Control
protocol. It specifies the necessary mapping an Inter-working Function would utilise to
achieve connectivity and functionality between an H.323 network and Public Land Mobile
Network.
The H.246 Annex E.3 and Annex E.4 cover the inter-working functions between GSM
Mobile Application Part (MAP of CCITT Signalling System number 7), PDC Mobile
Application Part (MAP of Japan Signalling System number 7) and H.225.0 Multimedia Call
Control protocol. The inter-working function specifications between GSM, PDC and H.323
networks are for further study.
This Annex requires H.323 and H.225.0 versions 4 or later. Version 4 products can be
identified by H.225.0 messages containing a protocolIdentifier = {itu-t (0) recommendation
(0) h (8) 2250 version (0) 4}.
22
Draft new Annex E.2 to ITU-T Recommendation H.246 – Inter-Working Function
(IWF) Between Ansi-41 (Americas) Mobile Application Part And H.225.0 (published in
COM 16-138)
The purpose of this annex is to describe the inter-working between ANSI-41 (Americas)
Mobile Application Part (MAP) of North American Signalling System number 7 and H.225.0
Multimedia protocols. It specifies the User Mobility Services using User Identification
Module (H323_UIM) and necessary mapping an Inter-working Function that would utilise to
achieve connectivity and functionality between an H.323 networks and Americas Public Land
Mobile Networks.
The details specification of User Mobility Services between H.323 and ANSI-41 Public Land
Mobile Networks are covered in the following functions:
AnnexE.2_GK: Specifications for Inter-working Function between ANSI-41 Mobile
Application Part (MAP) and H.225.0
H323_UIM: Specifications for ANSI-41 PLMN User Identification Module capability in
H.323 Terminal
This Annex requires H.323 and H.225.0 versions 4 or later. Version 4 products can be
identified by H.225.0 messages containing a protocolIdentifier = {itu-t (0) recommendation
(0) h (8) 2250 version (0) 4}.
23
Draft new Annex F to ITU-T Recommendation H.248 - Facsimile, text conversation and
call discrimination packages (published in COM 16-126)
H.248 Annex F describes packages for fax, text telephone, call type discrimination, and data
call detection for use with the H.248 Gateway Control Protocol. As defined in H.248, a
"package" is an extension to H.248 that supports specific behavior.
The packages are intended for control over gateway functions for transport of facsimile or text
conversation between different network environments. Extensions can be made for other
kinds of data transport.
-9-
24
Draft new Annex G to ITU-T Recommendation H.248 - User Interface Elements and
Actions Packages (published in COM 16-130)
The packages in H.248 Annex G define a framework for specifying capabilities associated
with user interface elements, such as text display, keys, dynamically labeled keys, indicators
and alphanumeric input. In addition, specific extension packages for telephone keypads and
telephone function keys are defined.
25
Draft new Annex H to ITU-T Recommendation H.248 - Transport over SCTP
(published in COM 16-131)
H.248 Annex H defines the transport of H.248 Gateway Control Protocol messages over the
Stream Control Transmission Protocol (SCTP). SCTP is an alternative to UDP or TCP.
Transport of H.248 over UDP or TCP is defined in H.248 Annex D.
26
Draft new Annex I to ITU-T Recommendation H.248 - Transport over ATM (published
in COM 16-132)
H.248 Annex I defines the transport of H.248 Gateway Control Protocol messages over ATM.
ATM transport is an alternative to UDP or TCP. Transport of H.248 over UDP or TCP is
defined in H.248 Annex D.
27
Draft new Annex J to ITU-T Recommendation H.248 - Dynamic Tone Definition
package (published in COM 16-123)
H.248 Annex J defines a dynamic tone definition package for use with the H.248 Gateway
Control Protocol. The dynamic tone definition package allows flexible tone specification in a
media gateway for feedback to audio receivers. A tone can be defined by assigning properties
(for example, frequency or duration) to an existing tone (i.e., a tone defined in some other
package) or a new tone. As defined in H.248, a "package" is an extension to H.248 that
supports specific behavior.
28
Draft new Annex K to ITU-T Recommendation H.248 - Generic Announcement package
(published in COM 16-124)
H.248 Annex K defines a generic announcement package for use with the H.248 Gateway
Control Protocol. The generic announcement package provides a media gateway controller
with the ability to control announcements in a media gateway. Control is provided by the
definition of announcement events (for example, "announcement completed") and
announcement signals (for example, "play a specified announcement"). As defined in H.248,
a "package" is an extension to H.248 that supports specific behavior.
29
Draft new ITU-T Recommendation H.450.9 - Call Completion Supplementary Services
for H.323 (published in COM 16-117)
This new Recommendation describes the procedures and the signalling protocol for the Call
Completion supplementary services in H.323.
The Call Completion supplementary services are Completion of Calls to Busy Subscribers
(SS-CCBS) and Completion of Calls on No Reply (SS-CCNR).
SS-CCBS enables a calling User A, encountering a busy destination User B, to have the call
completed when User B becomes not busy, without having to make a new call attempt.
SS-CCNR enables a calling User A, encountering a destination User B that, though alerted,
does not answer, to have the call completed when User B becomes not busy again after a
period of activity, without having to make a new call attempt.
This Recommendation makes use of the "Generic functional protocol for the support of
supplementary services in H.323" as defined in Recommendation H.450.1.
- 10 -
This Recommendation requires H.323 version 2 (1998) or later. Version 2 products can be
identified by H.225.0 messages containing a protocolIdentifier  {itu-t (0) recommendation
(0) h (8) 2250 version (0) 2} and H.245 messages containing a protocolIdentifier  {itu-t (0)
recommendation (0) h (8) 245 version (0) 3}.
The procedures and the signalling protocol of this Recommendation are derived from the Call
Completion supplementary service specified in ISO/IEC 13866 and 13870.
30
Draft Corrigendum to ITU-T Recommendation G.722.1 (published in COM 16-133)
This Corrigendum corrects three changes necessary to the existing C code (Release 1.1) that is
supplied with ITU-T Recommendation G.722.1. In each case, it corrects an error that was
introduced when the original C code (know as release code3.003 at the time of Determination)
was converted to use basic operators. The corrected code will be labelled as Release 1.2.
Each of the following three sections detail a separate set of corrections. The original test
vectors supplied with G.722.1 continue valid.
31
Draft for corrigendum 1 to second edition of common-text Recommendation H.262 |
ISO/IEC 13818-2 (a.k.a. Corrigendum 3 of H.262 | ISO/IEC 13818-2) for correction of
reserved extension data handling (published in COM 16-135)
This technical corrigendum corrects the description of the handling of reserved extension data
within an H.262 elementary video bitstream. In order to enable the future adoption of
backward-compatible extensions to the H.262 syntax, the proper decoder response to the
presence of reserved extension data must be clearly specified. This technical corrigendum
corrects an oversight in the description of the decoder response to such data.
32
Draft new Annex U to ITU-T Recommendation H.263 – Enhanced reference picture
selection (published in COM16-R77)
An optional Enhanced Reference Picture Selection (ERPS) mode capable of providing
enhanced coding efficiency and enhanced error resilience (particularly against loss of data
packets). The ERPS mode operates by managing a multi-picture buffer of stored pictures.
33
Draft new Annex V to ITU-T Recommendation H.263 – Data partitioned slice (DPS)
(published in COM16-R77)
An optional Data Partitioned Slice (DPS) mode capable of providing enhanced error
resilience (particularly against localized corruption of bitstream contents during transmission).
The DPS mode operates by separating header and motion vector data from DCT coefficient
data in the bitstream and by protecting motion vector data using a reversible representation.
34
Draft new Annex W to ITU-T Recommendation H.263 – Additional Supplemental
Enhancement Information (published in COM16-R77)
Optional Additional Supplemental Enhancement Information which can be added to an H.263
bitstream to provide backward-compatible enhancements, including:
 Indication of use of a specific fixed-point IDCT
 Picture Messages, including the message types of:
o Arbitrary Binary Data,
o Text (Arbitrary, Copyright, Caption, Video Description, or Uniform Resource
Identifier),
o Picture Header Repetition (Current, Previous, Next with Reliable Temporal
Reference, or Next with Unreliable Temporal Reference),
o Interlaced Field Indications (Top or Bottom), and
o Spare Reference Picture Identification.
- 11 -
35
Draft for amendment 1 to second edition of common-text Recommendation H.262 |
ISO/IEC 13818-2 (a.k.a. Amendment 7 of H.262 | ISO/IEC 13818-2) for video
elementary stream content description data (published in COM 16-136)
This amendment provides an ability to send supplemental "content description data" within
H.262 video elementary streams. The content description data that can be carried includes
picture capture timing information, additional pan-scan parameters, an indication of the visual
active region within the video picture, and a coded representation of the picture size in bytes.
36
Draft new Annex A to ITU-T Recommendation G.191 – Floating point version of
G.772.1 (published in COM 16-139)
G.191 Annex A describes the ITU-T Software Tools Library Release 2000 (STL2000). The
STL2000 contains improvements and error corrections of the STL96 (the version of the
ITU-T STL approved in 1996). In particular, a G.727 module, new filter types, and a Basic
Operator module have been added, as well as support for more modern compilers.
37
Draft new Annex B to ITU-T Recommendation G.722.1 – Floating point version of
G.722.1 (published in COM 16-121)
G.722.1 implements a fixed point algorithm. This Annex contains the description of a floating
point extension to G.722.1, which will allow for easier implementation of the standard in
general-purpose processors.