H.323 Standards

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H.323 Core Documents

NOTE: The Implementers Guide must be read along with the standards. Important ITU-approved corrections are found in the Implementers Guide.

Listing of Annexes and Related Recommendations

H.323 Packet-based multimedia communications systems
Annex A H.245 messages used by H.323 endpoints
Annex B Procedures for layered video codecs
Annex C H.323 on ATM
Annex D Real-time fax over H.323
Annex E Multiplexed Call Signaling over UDP
Annex F Audio Simple Endpoint Type
Annex G Text Simple Endpoint Type
Annex J Secure Simple Endpoint Type
Annex K HTTP-based Service Control
Annex L Stimulus Control Protocol
Annex M1 Tunnelling of signalling protocols (QSIG) in H.323
Annex M2 Tunnelling of signalling protocols (ISUP) in H.323
Annex M3 Tunneling of DSS1 through H.323
Annex M4 Tunnelling of narrow band signalling syntax (NSS) for H.323
Annex M5 Tunnelling of Common Alerting Protocol (CAP) Messages in H.323
Annex P Transfer of Modem Signals over H.323
Annex Q Far End Camera Control and H.281 / H.224
Annex R Robustness Methods for H.323 Entities
H.225.0 Call signalling protocols and media stream packetization for packet-based multimedia communication systems
Annex B RTP Profile
Annex C RTP Payload Format for H.261 video streams
Annex D RTP Payload Format for H.261A video streams
Annex E Video packetization
Annex F Audio and multiplexed packetization
Annex G Communication Between Administrative Domains
Annex H H.225.0 Message Syntax (ASN.1)
Annex I H.263+ Video Packetization
H.245 Control Protocol for multimedia communication
Annex A Messages: Syntax
Annex B Messages: Semantic Definition
Annex C Procedures
Annex D Object Identifier Assignments
Annex E ISO/IEC 14496-2 Capability Definitions
Annex F Logical Channel Bit Rate Management Capability Definitions
Annex G ISO/IEC 14496-1 Capability Definitions
Annex H ISO/IEC 14496-3 Capability Definitions
Annex I GSM Adaptive Multi Rate Capability Definitions
H.246 Interworking of H-Series multimedia terminals with H-Series multimedia terminals and voice/voiceband terminals on GSTN and ISDN
Annex A H.323-H.320 Interworking
Annex C ISUP/H.225.0 Interworking
Annex E.1 MAP/H.225.0 Interworking
Annex E.2 ANSI-41 MAP/H.225.0 Interworking
Annex F H.323-H.324 Interworking
H.235.0 Security framework for H-series (H.323 and other H.245-based) multimedia systems
H.235.1 Baseline Security Profile
H.235.2 Signature Security Profile
H.235.3 Hybrid Security Profile
H.235.4 Direct and Selective Routed Call Security
H.235.5 Framework for secure authentication in RAS using weak shared secrets
H.235.6 Voice encryption profile with native H.235/H.245 key management
H.235.7 Usage of the MIKEY Key Management Protocol for SRTP
H.235.8 Key Exchange for SRTP using secure Signalling Channels
H.235.9 Security Gateway Support for H.323
H.239 Role management and additional media channels
H.241 Extended video procedures and control signals
H.249 Extended User Input Indications
H.350 Directory Services Architecture for Multimedia Conferencing
H.350.1 Directory Services Architecture for H.323
H.350.2 Directory Services Architecture for H.235
H.350.6 Directory Services Architecture for Call Forwarding and Preferences
H.361 End-to-End Quality of Service (QoS) and Service Priority Signalling
H.450.1 Generic functional protocol for the support of supplementary services in H.323
H.450.2 Call transfer supplementary service for H.323
H.450.3 Call diversion supplementary service for H.323
H.450.4 Call hold supplementary service for H.323
H.450.5 Call park and call pickup supplementary services for H.323
H.450.6 Call waiting supplementary service for H.323
H.450.7 Message waiting indication supplementary service for H.323
H.450.8 Name identification supplementary service for H.323
H.450.9 Call Completion Supplementary Services for H.323
H.450.10 Call offering supplementary services for H.323
H.450.11 Call intrusion supplementary services
H.450.12 Common Information Additional Network Feature for H.323
H.460.1 Guidelines for the use of the generic extensible framework
H.460.2 Number Portability interworking between H.323 and SCN networks
H.460.3 Circuit Status Map
H.460.4 Call Priority Designation
H.460.5 Transport of Multiple Q.931 IEs
H.460.6 Extended Fast Connect
H.460.7 Digit Maps
H.460.8 Querying for Alternate Routes
H.460.9 QoS Monitoring Reporting
H.460.10 Call Party Category
H.460.11 Delayed Call Establishment
H.460.12 Glare Control Indicator
H.460.13 Called User Release Control
H.460.14 Multi-Level Precedence and Pre-emption
H.460.15 Call Signalling Transport Channel Suspension and Redirection
H.460.16 Multiple-Message Release Sequence Capability
H.460.17 Tunneling RAS through H.225.0
H.460.18 Traversal of H.323 signalling across Network Address Translators and Firewalls
H.460.19 Traversal of H.323 media across Network Address Translators and Firewalls
H.460.20 Location Number for H.323
H.460.21 Message Broadcast for H.323 Systems
H.460.22 Negotiation of Security Protocols to Protect H.225.0 Call Signalling Message
H.460.23 Network address translator and firewall device determination in H.323 systems
H.460.24 Point to point media through network address translators and firewalls within H.323 systems
H.460.25 Transport of Geographic Information in H.323 Systems
H.460.26 Using H.225.0 call signalling connection as transport for media
H.501 Protocol for mobility management and intra/inter-domain communication in multimedia systems
H.510 Mobility for H.323 multimedia systems
H.530 Symmetric Security Procedures for H.510

Ecma International Technical Committee TC32 Standards: Interoperability Between H.323 and QSIG

Work has taken place in Ecma International Technical Committee TC32 on interoperability between H.323 and QSIG, the internationally standardised signalling system for use in circuit-switched enterprise networks. This work is of importance for the evolution of existing enterprise networks towards voice and multi-media over IP. The following standards, available for free download from the Ecma web site, address both interworking between H.323 and QSIG and the tunnelling of QSIG over H.323:

  • ECMA-332 -- Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Basic Services.
  • ECMA-307 -- Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Generic Functional Protocol for the Support of Supplementary Services (ISO/IEC 21409).
  • ECMA-308 -- Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Call Transfer Supplementary Services (ISO/IEC 21410).
  • ECMA-309 -- Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Call Diverson Supplementary Services (ISO/IEC 21411).
  • ECMA-326 -- Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Call Completion Supplementary Services.
  • ECMA-333 -- Private Integrated Services Network (PISN) - Mapping Functions for the Tunnelling of QSIG through H.323 Networks.

More Information

To obtain copies of the H.323-related documents, visit the ITU-T website.

More information about Standards and unofficial copies of draft standards, visit the H.323 Information Site on Packetizer.

Ecma International More Information.


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