1 Scope
2 References
3 Definitions
4 Symbols
and abbreviations
5 Conventions
6 System
description
6.1 Information
streams
6.2 Terminal
characteristics
6.3 Gateway
characteristics
6.4 Gatekeeper
characteristics
6.5 Multipoint
controller characteristics
6.6 Multipoint
processor characteristics
6.7 Multipoint
control unit characteristics
6.8 Multipoint
capability
6.9 Models for
supplementary
services
7 Call
signalling
7.1 Addresses
7.2 Registration,
Admission and Status (RAS) channel
7.3 Call
signalling channel
7.4 Call
reference value
7.5 Call
ID
7.6 Conference
ID and conference goal
7.7 Endpoint
call capacity
7.8 Caller
identification services
7.9 Generic
extensible framework
8 Call
signalling
procedures
8.1 Phase A –
Call setup
8.2 Phase B –
Initial communication and capability exchange
8.3 Phase C –
Establishment of audiovisual communication
8.4 Phase D –
Call services
8.5 Phase E –
Call
termination
8.6 Protocol
failure handling
9 Interoperation
with other terminal
types
9.1 Speech-only
terminals
9.2 Visual
telephone terminals over the ISDN (ITU-T Rec. H.320)
9.3 Visual
telephone terminals over GSTN (ITU-T
Rec. H.324)
9.4 Visual
telephone terminals over mobile radio (Annex C/H.324, a.k.a.
"H.324/M")
9.5 Visual
telephone terminals over ATM (H.321 and H.310
RAST)
9.6 Visual
telephone terminals over guaranteed quality of service LANs (ITU-T Rec. H.322)
9.7 Simultaneous
voice and data terminals over GSTN (ITU-T Rec. V.70)
9.8 T.120
terminals on the packet-based network
9.9 Gateway
for H.323 media transport over ATM
10
Optional enhancements
10.1 Encryption
10.2 Multipoint
operation
10.3 Call Linkage in
H.323
10.4 Tunnelling of non-H.323 signalling
messages
10.5 Use of RTP payload for DTMF digits, telephony
tones and telephony signals
11
Maintenance
11.1 Loopbacks for maintenance
purposes
11.2 Monitoring
methods
Annex A – H.245 messages used by H.323 endpoints
Annex B – Procedures for layered video codecs
B.1 Scope
B.2 Introduction
B.3 Scalability
methods
B.4 Call
establishment
B.5 Use of RTP
sessions and codec layers
B.6 Possible
layering models
B.7 Impact on
multipoint
conferences
B.8 Use of
network QoS for layered video streams
Annex C – H.323 on ATM
C.1 Introduction
C.2 Scope
C.3 Architecture
C.4 Protocol
section
Annex D – Real-time facsimile over H.323 systems
D.1 Introduction
D.2 Scope
D.3 Procedures
for opening channels to send T.38 packets
D.4 Non-fast
connect procedures
D.5 Replacing
an existing audio stream with a T.38 fax
stream
D.6 Usage of
the maxBitRate/bandWidth in
messages
D.7 Interactions
with gateways and T.38/Annex B devices
Page
Annex E – Framework and wire‑protocol for multiplexed call signalling
transport
E.1 Scope
E.2 H.225.0
call signalling over Annex E
Annex F – Simple endpoint types
F.1 Introduction
F.2 Specification
conventions
F.3 Scope
F.4 Normative
references
F.5 Abbreviations
F.6 Simple
(Audio) Endpoint Type – System functionality
overview
F.7 Procedures
for Simple Endpoint Types
F.8 Security
extensions
F.9 Interoperability
considerations
F.10 Implementation
notes (Informative)
Annex G – Text conversation and Text SET
G.1
Introduction
G.2 Scope
G.3 References
G.4 Definitions
G.5 Capability
Advertisement for Text in H.323
G.6 Procedures
for opening channels for T.140 text conversation
G.7 Framing
and buffering of T.140 data
G.8 Interaction
with text conversation facilities in other
devices
G.9 Multipoint
considerations
G.10 Text SET: Text Conversation Simple Endpoint
Type
Annex J – Security for Annex F
J.1 Introduction
J.2 Specification
conventions
J.3 Scope
J.4 Abbreviations
J.5 Normative
references
J.6 Secure Audio Simple
Endpoint Type (SASET)
Annex K – HTTP‑based service control transport
channel
K.1 Introduction
K.2 Service
control in H.323
K.3 Usage of
HTTP
K.4 Example
scenarios
K.5
References
Annex L – Stimulus control protocol
L.1 Scope
L.2 Introduction
L.3 Stimulus
framework
L.4 References
Annex M1 – Tunnelling of signalling protocols (QSIG) in
H.323
M1.1 Scope
M1.2 Normative references
M1.3 Endpoint
procedures
M1.4 Tunnelling of QSIG connection-oriented
call-independent signalling
M1.5 Gatekeeper procedures
Annex M2 – Tunnelling of signalling protocols (ISUP) in
H.323
M2.1 Scope
M2.2 Normative references
M2.3 Endpoint
procedures
M2.4 Gatekeeper procedures
Annex M3 – Tunnelling of DSS1 through H.323
M3.1 Scope
M3.2 Normative references
M3.3 Endpoint
procedures
M3.4 Tunnelling of bearer-independent DSS1
signalling
M3.5 Gatekeeper procedures
Annex M4 – Tunnelling of narrow‑band signalling syntax (NSS) for
H.323
M4.1 Scope
M4.2 References
M4.3 H.225.0 Endpoint procedures
M4.4 Gatekeeper procedures
M4.5 RAS procedures for direct-routed calls
Annex O – Usage of URLs and DNS
O.1 Scope
O.2 Normative
references
O.3 Informative
references
O.4 H.323
URL
O.5 Encoding
of H.323 URL in H.323 messages
O.6 Non-H.323
URLs and URIs within the context of
H.323
O.7 H.323 URL
parameters
O.8 Usage of
the H.323 URL
O.9 Resolving
an H.323 URL to IP Address using DNS
O.10 Using DNS SRV Resource
Records
Page
Annex P – Transfer of modem signals over H.323
P.1 Scope
P.2 References
P.3 Definitions
P.4 Abbreviations
P.5 Introduction
P.6 Capability
advertisement
P.7 Call
establishment
P.8 Logical
channel
signalling
Annex Q – Far-end camera control and H.281/H.224
Q.1 Scope
Q.2 References
Q.3 Introduction
Q.4 Far-end
camera control protocol
Q.5 RTP header
information
Annex R – Robustness methods for H.323 entities
R.1 Introduction and scope
R.2 Normative
references
R.3 Definitions
R.4 Abbreviations
R.5 Overview
of the two methods
R.6 Common
mechanisms
R.7 Method A:
State recovery from neighbours
R.8 Method B:
State recovery from a shared
repository
R.9 Interworking
between robustness methods
R.10 Procedures for recovery
R.11 GenericData
usage
R.12 Informative Note 1: Background on robustness
methods
R.13 Informative Note 2: Call state sharing between
an entity and its backup peer
Appendix I – Sample MC to terminal communication mode
command
I.1 Sample
conference Scenario A
I.2 CommunicationModeTable
sent to all
endpoints
I.3 Sample
conference Scenario B
I.4 CommunicationModeTable
sent to all
endpoints
Appendix II – Transport level resource reservation
procedures
II.1 Introduction
II.2 QoS support for H.323
II.3 RSVP background
II.4 The H.245 capability exchange
phase
II.5 Open logical channel and setting up
reservations
II.6 Close logical channel and tearing down
reservations
II.7 Resource reservation for multicast H.323
logical channels
II.8 Synchronized
RSVP
Appendix III – Gatekeeper‑based user location
III.1 Introduction
III.2 Signalling
Appendix IV – Signalling prioritized alternative logical channels in
H.245
IV.1 Introduction
IV.2 Signalling
Appendix V – Use of E.164 and ISO/IEC 11571 numbering
plans
V.1 E.164
numbering plan
V.2 Private
network number
V.3 H.323
versions 1, 2 and 3 usage
Appendix VI – Description of a typical H.323 system over
IP