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 A	RTP/RTCP
	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.