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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.323 System
Implementors’
Guide
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(6 February 2009)
SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS
Infrastructure of audiovisual services – Communication
procedures
Implementors’ Guide for Recommendations of
the H.323 System (Packet-based multimedia
communications systems):
H.323, H.225.0, H.245, H.246, H.283, H.341,
H.450 Series, H.460 Series, and H.500 Series
Implementors’ Guide for Recommendations of the H.323 System (2009-02) i
Summary
This document is a compilation of reported defects identified in the versions of ITU-T
Recommendation H.323 and its related Recommendations currently in force. It must be read in
conjunction with the Recommendations to serve as an additional authoritative source of
information for implementors. The changes, clarifications and corrections defined herein are
expected to be included in future versions of affected H.323-series Recommendations.
This revision contains all updates submitted up to and including those at Study Group 16 meeting
in Geneva, 27 January – 6 February, 2009.
This Implementors’ Guide was approved by ITU-T Study Group 16 on 6 February 2008
(TD 39R1/Plen) and it obsoletes the earlier version of this Implementors’ Guide approved on 2
May 2008.
Implementors’ Guide for Recommendations of the H.323 System (2009-02) ii
Contact Information
ITU-T Study Group 16 /
Rapporteur Question 2/16
Paul E. Jones
Cisco Systems, Inc.
7025 Kit Creek Road
Research Triangle Park, NC 27709. USA
Tel: +1 919 476 2048
Fax:
E-mail: paulej@packetizer.com
ITU-T Study Group 16 /
Rapporteur Question 3/16
NTEC Australia Pty. Ltd.
48 Percy St, Newport
Victoria 3015. Australia
Tel: +61 3 9391 3457
Fax: +61 3 9391 3457
Email: Christian.Groves@nteczone.com
ITU-T Study Group 16 /
Editor ITU-T Rec. H.235.0
Editor Rec. H.235 series
Implementors’ Guide
Martin Euchner
Siemens AG
Hofmannstr 51
81359 Munich, Germany
Tel: +49 89 722 5 57 90
Fax: +49 89 722 6 23 66
E-mail: martin.euchner@siemens.com
Editor ITU-T Rec. H.323 Stephen Botzko
Polycom
100 Minuteman Road
Andover, MA 01810, USA
Tel: +1 978 292-5395
Fax: +1 978 292-5395
Email: Stephen.Botzko@polycom.com
Editor ITU-T Rec. H.341 Craig Blasberg
Cisco Systems, Inc.
7025 Kit Creek Road
Research Triangle Park, NC 27709. USA
Tel: +1 919 392 5760x
Fax: +1 919 392 6801
E-mail: blasberg@cisco.com
Editor ITU-T Rec. H.225.0
Editor ITU-T Rec. H.323 Series
Implementors’ Guide
Muthu Arul Mozhi Perumal
Cisco Systems, Inc.
Divyashree Chambers ‘B’ Wing, No.11
O’Shaugnessey Road, Off Langford Road
Bangalore, India – 560027
Tel: +91-80-41033563
Fax: +91-80-22230167
E-mail: mperumal@cisco.com
Editor ITU-T Rec. H.225.0
Annex G
Miner Gleason
Cisco Systems, Inc.
7025 Kit Creek Road
Research Triangle Park, NC 27709. USA
Tel: +1 919 392 8752
Fax: +1 919 392 7065
E-mail: mgleason@cisco.com
Editor ITU-T Rec. H.245 Mike Nilsson
BT Labs
Ipswitch. United Kingdom
Tel: +44 1 473 645413
Fax: +44 1 473 643791
E-mail: mike.nilsson@bt.com
Editor ITU-T Rec. H.246 Ogishi Hisataka E-mail: ogishi.hisataka@lab.ntt.co.jp
ITU-T Study Group 16 /
Rapporteur Question 5/16 &
Editor ITU-T Rec. for
H.450.{1,2,3,4,5, 6,9,10,11,12}
Ernst Horvath
Siemens Austria
Gudrunstrasse 11
A-1101 Vienna. Austria
Tel: +43 5 1707 45897
Fax: +43 5 1707 56992
E-mail: ernst.horvath@siemens.com
Editor ITU-T Rec. H.450.7 Dave Walker
SS8 Networks
135 Michael Cowpland Drive, Suite 200
Kanata, Ontario, K2M 2E9. Canada
Tel: +1 613 592 8450
Fax: +1 613 592 9634
E-mail: dwalker@ss8networks.com
Editor ITU-T Rec. H.450.8 Glen Freundlich
Avaya Communication
1300 W. 120th Avenue
Westminster, CO 80234. USA
Tel: +1 303 538 2899
Fax: +1 303 538 3007
E-mail: ggf@avaya.com
Editor ITU-T Rec. H.460.1 P. Cordell E-mail: pete@tech-know-ware.com
Editor ITU-T Rec. H.460.4 Gary Thom E-mail: gthom@delta-info.com
Editor ITU-T Rec. H.460.5 Sasha Ruditsky E-mail: sasha@radvision.com
Editor ITU-T Rec. H.460.6 Bob Gilman E-mail: rrg@avaya.com
Editor ITU-T Rec. H.460.{2,7,8}
Paul Jones (see above for Q.2/16) E-mail: paulej@packetizer.com
Editor ITU-T Rec. H.460.3 Louis Fourie E-mail: lfourie@cisco.com
Editor ITU-T Rec. H.460.9 Ernst Horvath (see above for Q.5/16) E-mail: ernst.horvath@siemens.at
Note: Not all Recommendations indicated above have IG issues in this document. The information above is provided for completeness.
Implementors’ Guide for Recommendations of the H.323 System (2009-02) iii
Table of Contents
1
SCOPE ....................................................................................................................................................................... 1
2
INTRODUCTION .................................................................................................................................................... 1
3
REFERENCES.......................................................................................................................................................... 1
4
NOMENCLATURE.................................................................................................................................................. 3
5
TECHNICAL AND EDITORIAL CORRECTIONS TO H.323 SERIES RECOMMENDATIONS ................ 3
5.1
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.323
(2006) ................................... 3
5.2
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.225.0
(2006) ................................ 7
5.3
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.245
(5/2006) .............................. 13
5.4
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.246
(2006) ................................. 14
5.5
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.235
S
ERIES
................................. 14
5.6
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.450
S
ERIES
................................. 15
5.6.1
Technical and Editorial Corrections to H.450.1 (1998) ........................................................................... 15
5.6.2
Technical and Editorial Corrections to H.450.2 (1998) ........................................................................... 18
5.6.3
Technical and Editorial Corrections to H.450.3 (1998) ........................................................................... 21
5.6.4
Technical and Editorial Corrections to H.450.4 (1999) ........................................................................... 22
5.6.5
Technical and Editorial Corrections to H.450.5 (1999) ........................................................................... 29
5.6.6
Technical and Editorial Corrections to H.450.7 (1999) ........................................................................... 29
5.6.7
Technical and Editorial Corrections to H.450.8 (2000) ........................................................................... 30
5.6.8
Technical and Editorial Corrections to H.450.12 (2001) ......................................................................... 30
5.7
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.341
(1999) ................................. 34
5.7.1
Corrections to H.341 Annex B-1 H225-MIB ............................................................................................ 34
5.7.2
Corrections to H.341 Annex B-2 RAS-MIB .............................................................................................. 40
5.7.3
Support for Expanded Country Code Values in T.35 in H.341 Annex B-3 ............................................... 42
5.8
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.283
(1999) ................................. 43
5.8.1
Support for Expanded Country Code Values in T.35................................................................................ 43
5.9
T
ECHNICAL AND
E
DITORIAL
C
ORRECTIONS TO
ITU-T
R
ECOMMENDATION
H.460
S
ERIES
................................. 43
5.9.1
Technical and Editorial Corrections to H.460.1 (2002) ........................................................................... 43
5.9.2
Technical and Editorial Corrections to H.460.2 (2001) ........................................................................... 44
5.9.3
Technical and Editorial Corrections to H.460.6 (2002) ........................................................................... 45
5.9.4
Technical and Editorial Corrections to H.460.7 (2002) ........................................................................... 49
5.9.6
Technical and Editorial Corrections to H.460.18 (2005) ......................................................................... 51
5.9.7
Technical and Editorial Corrections to H.460.19 (2005) ......................................................................... 54
6
IMPLEMENTATION CLARIFICATION ........................................................................................................... 62
6.1
T
OKEN
U
SAGE IN
H.323
S
YSTEMS
..................................................................................................................... 62
6.2
H.235
R
ANDOM
V
ALUE
U
SAGE IN
H.323
S
YSTEMS
........................................................................................... 63
6.3
G
ATEWAY
R
ESOURCE
A
VAILABILITY
M
ESSAGES
.............................................................................................. 63
6.4
O
PEN
L
OGICAL
C
HANNEL IN FAST
S
TART
............................................................................................................. 63
6.5
C
LARIFICATION IN
Q.931
(1993) ........................................................................................................................ 63
6.6
G
RACEFUL
C
LOSURE OF
TCP
C
ONNECTIONS
..................................................................................................... 63
6.7
R
ACE
C
ONDITION ON
S
IMULTANEOUS
C
LOSE OF
C
HANNELS
............................................................................. 63
6.8
A
CCEPTANCE OF
F
AST
C
ONNECT
....................................................................................................................... 63
6.9
S
EMANTIC
D
IFFERENCES BETWEEN
L
IGHTWEIGHT
RRQ
S AND
IRQ/IRR
M
ESSAGES
......................................... 64
6.10
S
PECIFYING THE
P
AYLOAD
F
ORMAT FOR A
C
HANNEL
........................................................................................ 64
6.11
V
ERSION
D
EPENDENCIES IN
A
NNEXES
............................................................................................................... 64
6.12
R
OUTING THROUGH
S
IGNALING
E
NTITIES AND
D
ETECTING
L
OOPS
.................................................................... 65
6.13
P
ACKETIZATION FOR
G.729,
G.729
A
,
G.711,
AND
G.723.1 ............................................................................... 66
6.14
C
HECKING VERSIONS FOR
T.38
AND
V.150.1 ..................................................................................................... 67
7
ALLOCATED OBJECT IDENTIFIERS AND PORT NUMBERS ................................................................... 67
7.1
A
LLOCATED
O
BJECT
I
DENTIFIERS
...................................................................................................................... 67
7.2
A
LLOCATED
P
ORT
N
UMBERS
............................................................................................................................. 68
8
USE OF E.164 AND ISO/IEC 11571 NUMBERING PLANS ............................................................................. 68
8.1
E.164
NUMBERING PLAN
.................................................................................................................................... 68
8.2
P
RIVATE
N
ETWORK
N
UMBER
............................................................................................................................ 71
9
ASN.1 USAGE, GUIDELINES, AND CONVENTIONS ..................................................................................... 72
9.1
NULL,
BOOLEAN,
AND
NULL/BOOLEAN
OPTIONAL............................................................................... 72
9.2
ASN.1
U
SAGE IN
H.450-S
ERIES
R
ECOMMENDATIONS
....................................................................................... 73
Implementors’ Guide for Recommendations of the H.323 System (2009-02) iv
9.2.1
ASN.1 version and encoding rules ............................................................................................................ 73
9.2.2
Tagging ..................................................................................................................................................... 73
9.2.3
Basic ASN.1 Types .................................................................................................................................... 73
9.2.4
Value sets, subtyping and constraints used in H.450.x: ............................................................................ 74
9.2.5
Object classes, parameterization, general constraints, and ROS ............................................................. 74
9.2.6
Extensibility and non-standard information ............................................................................................. 74
9.2.7
List of Operation and Error Codes ........................................................................................................... 75
ANNEX: DEFECT REPORT FORM FOR RECOMMENDATIONS OF THE H.323 SYSTEM ...................... 78
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