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I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n
ITU-T
H.245
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(03/2022)
SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS
Infrastructure of audiovisual services – Communication
procedures
Control protocol for multimedia communication
Recommendation ITU-T H.245
ITU-T H-SERIES RECOMMENDATIONS
AUDIOVISUAL AND MULTIMEDIA SYSTEMS
CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS
H.100–H.199
INFRASTRUCTURE OF AUDIOVISUAL SERVICES
General
H.200–H.219
Transmission multiplexing and synchronization
H.220–H.229
Systems aspects
H.230–H.239
Communication procedures
H.240–H.259
Coding of moving video
H.260–H.279
Related systems aspects
H.280–H.299
Systems and terminal equipment for audiovisual services
H.300–H.349
Directory services architecture for audiovisual and multimedia services
H.350–H.359
Quality of service architecture for audiovisual and multimedia services
H.360–H.369
Telepresence, immersive environments, virtual and extended reality
H.420–H.439
Supplementary services for multimedia
H.450–H.499
MOBILITY AND COLLABORATION PROCEDURES
Overview of Mobility and Collaboration, definitions, protocols and procedures
H.500–H.509
Mobility for H-Series multimedia systems and services
H.510–H.519
Mobile multimedia collaboration applications and services
H.520–H.529
Security for mobile multimedia systems and services
H.530–H.539
Security for mobile multimedia collaboration applications and services
H.540–H.549
VEHICULAR GATEWAYS AND INTELLIGENT TRANSPORTATION SYSTEMS (ITS)
Architecture for vehicular gateways
H.550–H.559
Vehicular gateway interfaces
H.560–H.569
BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES
Broadband multimedia services over VDSL
H.610–H.619
Advanced multimedia services and applications
H.620–H.629
Content delivery and ubiquitous sensor network applications
H.640–H.649
IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV
General aspects
H.700–H.719
IPTV terminal devices
H.720–H.729
IPTV middleware
H.730–H.739
IPTV application event handling
H.740–H.749
IPTV metadata
H.750–H.759
IPTV multimedia application frameworks
H.760–H.769
IPTV service discovery up to consumption
H.770–H.779
Digital Signage
H.780–H.789
E-HEALTH MULTIMEDIA SYSTEMS, SERVICES AND APPLICATIONS
Personal health systems
H.810–H.819
Interoperability compliance testing of personal health systems (HRN, PAN, LAN, TAN and
WAN)
H.820–H.859
Multimedia e-health data exchange services
H.860–H.869
Safe listening
H.870–H.879
For further details, please refer to the list of ITU-T Recommendations.
Rec. ITU-T H.245 (03/2022) i
Recommendation ITU-T H.245
Control protocol for multimedia communication
Summary
Recommendation ITU-T H.245 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.
Products claiming compliance with Version 17 of Recommendation ITU-T H.245 shall comply with
all of the mandatory requirements of this Recommendation. Version 17 products can be identified by
Recommendation ITU-T H.245 TerminalCapabilitySet messages containing a protocolIdentifier value
of {ITU-T (0) recommendation (0) h (8) 245 version (0) 17}.
Relative to Recommendation ITU-T H.245 Version 16 (2011), this version incorporates the following
changes:
– Add procedures in Annex V to support better interoperability between IPv4 and IPv6 devices.
– Updated Table VIII.1 to support the revisions made to Recommendation ITU-T H.241.
– Support of an SCTP media transport in H.323 systems, including the addition of Annex U.
– Support of DTLS media transport in H.323 systems, including the addition of Annex U.
– Support of out of band data channel establishment for Annex U.
– Propose updates to Recommendation ITU-T H.245 to support SCTP: split dtls-sctp into
udp-dtls-sctp and tcp-dtls-sctp.
– Add ExtendedAudioCapability and ExtendedDataCapability in Recommendation
ITU-T H.245.
ii Rec. ITU-T H.245 (03/2022)
History
Edition
Recommendation
Approval
Study Group
Unique ID
*
1.0
ITU-T H.245
1996-03-20
15
11.1002/1000/3336
2.0
ITU-T H.245
1997-07-11
16
11.1002/1000/4148
3.0
ITU-T H.245
1998-02-06
16
11.1002/1000/4238
4.0
ITU-T H.245
1998-09-25
16
11.1002/1000/4500
5.0
ITU-T H.245
1999-05-27
16
11.1002/1000/4679
6.0
ITU-T H.245
2000-02-17
16
11.1002/1000/4929
7.0
ITU-T H.245
2000-11-17
16
11.1002/1000/5259
8.0
ITU-T H.245
2001-07-29
16
11.1002/1000/5514
9.0
ITU-T H.245
2003-02-06
16
11.1002/1000/6172
10.0
ITU-T H.245
2003-07-14
16
11.1002/1000/6457
11.0
ITU-T H.245
2005-01-08
16
11.1002/1000/7442
12.0
ITU-T H.245
2005-10-07
16
11.1002/1000/8568
13.0
ITU-T H.245
2006-05-29
16
11.1002/1000/8806
14.0
ITU-T H.245
2008-06-13
16
11.1002/1000/9474
15.0
ITU-T H.245 v15
2009-12-14
16
11.1002/1000/10626
16.0
ITU-T H.245 v16
2011-05-14
16
11.1002/1000/11290
17.0
ITU-T H.245 (V17)
2022-03-16
16
11.1002/1000/14947
Keywords
Control protocol, H.323 system, multimedia communication.
*
To access the Recommendation, type the URL http://handle.itu.int/ in the address field of your web
browser, followed by the Recommendation's unique ID. For example, http://handle.itu.int/11.1002/1000/
11830-en.
Rec. ITU-T H.245 (03/2022) iii
FOREWORD
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
telecommunications, information and communication technologies (ICTs). The ITU Telecommunication
Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,
operating and tariff questions and issuing Recommendations on them with a view to standardizing
telecommunications on a worldwide basis.
The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes
the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics.
The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.
In some areas of information technology which fall within ITU-T's purview, the necessary standards are
prepared on a collaborative basis with ISO and IEC.
NOTE
In this Recommendation, the expression "Administration" is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain
mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the
Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some other
obligatory language such as "must" and the negative equivalents are used to express requirements. The use of
such words does not suggest that compliance with the Recommendation is required of any party.
INTELLECTUAL PROPERTY RIGHTS
ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve
the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or
applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of
the Recommendation development process.
As of the date of approval of this Recommendation, ITU had not received notice of intellectual property,
protected by patents/software copyrights, which may be required to implement this Recommendation.
However, implementers are cautioned that this may not represent the latest information and are therefore
strongly urged to consult the appropriate ITU-T databases available via the ITU-T website at
http://www.itu.int/ITU-T/ipr/.
© ITU 2022
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior
written permission of ITU.
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