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H.323 Standards

For a history of previously approved documents and for current work in progress, please refer to the document status page.

Draft H.323 Core Documents
Version H.323 H.225.0 H.225.0 ASN.1 H.245 H.245 ASN.1 Implementers Guide, Errata
1996 (V1) H.323v1 H.225.0v1 h2250v1.asn H.245v2 H245v2.asn Complete Text
1998 (V2) H.323v2 H.225.0v2 h2250v2.asn H.245v3 H245v3.asn Document 1 + Document 2
1999 (V3) H.323v3 H.225.0v3 h2250v3.asn H.245v5 H245v5.asn Complete Text
2000 (V4) H.323v4 H.225.0v4 h2250v4.asn H.245v7 H245v7.asn Complete Text
2003 (V5) H.323v5 H.225.0v5 h2250v5.asn H.245v9 H245v9.asn Complete Text
2006 (V6) H.323v6 H.225.0v6
(Am1)
h2250v6.asn
(Hypertext)
H.245v13 H245v13.asn Complete Text, H.245 Erratum 1, H.245 Erratum 2
2009 (V7) H.323v7
(Am1)
H.225.0v7
(Am1)
h2250v7.asn
(Hypertext)
H.245v15 H245v15.asn
(Hypertext)
Complete Text
NOTE: The Implementers Guide must be read along with the standards. Important ITU-approved corrections are found in those documents. For some standards, the ITU-T has published Amendments and Corrigendum documents that must also be read with the standard. Please refer to the ITU-T Recommendations Page.

Other Related Draft Recommendations
Standard Document Title and Related Documents
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 for H.264
H.245 Control Protocol for Multimedia Communication (H.245 Editor's Page)
H.246 H.323/PSTN Interworking
H.249 Extended User Input Indications
H.341 Multimedia management information base
H.350-Series Directory Services-Related Standards
H.360 An architecture for end-to-end QoS control and signalling
H.361 End-to-End Quality of Service (QoS) and Service Priority Signalling in H.323 Systems
H.450.1 Supplementary Services Framework
H.450.2 Call Transfer Supplementary Service
H.450.3 Call Diversion Supplementary Service
H.450.4 Call Hold Supplementary Service
H.450.5 Call Park and Pickup Supplementary Service
H.450.6 Call Waiting Supplementary Service
H.450.7 Message Waiting Indication Supplementary Service
H.450.8 Name Identification Supplementary Service
H.450.9 Call Completion Supplementary Service
H.450.10 Call Offer Supplementary Service
H.450.11 Call Intrusion Supplementary Service
H.450.12 Common Information Additional Network Feature for H.323
H-Series Supplement 4 H.460.x Identifiers (H-Series Supplement 4)
H.460.1 Guidelines for the Use of the Generic Extensible Framework
H.460.2 Number Portability
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 (ASN.1 File)
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 Security Profile Negotiation
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.460.27 End-to-end session identifier for ITU-T H.323 systems
H.501 Protocol for mobility management and intra/inter-domain communication in multimedia systems (ASN.1 File)
H.510 Mobility for H.323 multimedia systems
H.530 Symmetric Security Procedures for H.510

Draft Annexes
Standard Document Title
H.460.9 Annex B RTCP Extended Reports

RTP-Related Documents
RFC Document Title
RFC 1889 RTP: Transport Protocol for Real-Time Applications (obsolete: see RFC 3550)
RFC 1890 RTP Profile for Audio and Video Conferences with Minimal Control (obsolete: see RFC 3551)
RFC 2198 RTP Payload for Redundant Audio Data
RFC 2733 An RTP Payload Format for Generic Forward Error Correction (obsolete: see RFC 5109)
RFC 2793 RTP Payload for Text Conversation (obsolete: see RFC 4103)
RFC 2833 RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals (obsolete: see RFC 4733)
RFC 2959 Real-Time Transport Protocol Management Information Base
RFC 3389 RTP Payload for Comfort Noise
RFC 3550 RTP: Transport Protocol for Real-Time Applications
RFC 3551 RTP Profile for Audio and Video Conferences with Minimal Control
RFC 3611 RTP Control Protocol Extended Reports (RTCP XR)
RFC 3711 The Secure Real-time Transport Protocol (SRTP)
RFC 3952 RTP Payload Format for internet Low Bit Rate Codec (iLBC) Speech
RFC 4103 RTP Payload for Text Conversation
RFC 4571 Framing RTP and RTCP Packets over Connection-Oriented Transport
RFC 4585 Extended RTP Profile for RTCP-Based Feedback (RTP/AVPF)
RFC 4586 RTP/AVPF: Results of the Timing Rule Simulations
RFC 4588 RTP Retransmission Payload Format
RFC 4629 RTP Payload Format for ITU-T Rec. H.263 Video
RFC 4771 Integrity Transform Carrying Roll-Over for SRTP
RFC 4733 RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
RFC 4961 Symmetric RTP / RTP Control Protocol
RFC 5109 RTP Payload Format for Generic Forward Error Correction
RFC 5117 RTP Topologies
RFC 5285 A General Mechanism for RTP Header Extensions
RFC 5450 Transmission Time Offsets in RTP Streams
RFC 5506 Support for Reduced-Size RTCP: Opportunities and Consequences
RFC 5761 Multiplexing RTP Data and Control Packets on a Single Port
RFC 6184 RTP Payload Format for H.264 Video
RFC 6642 RTCP Extension for a Third-Party Loss Report
RFC 6679 Explicit Congestion Notification (ECN) for RTP over UDP
RFC 6792 Guidelines for Use of the RTP Monitoring Framework
RFC 6843 RTP Control Protocol (RTCP) Extended Report (XR) Block for Delay Metric Reporting
RFC 6865 Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME
RFC 6958 RTCP XR Block for Burst/Gap Loss Metric Reporting
RFC 7002 RTCP XR Block for Discard Count Metric Reporting
RFC 7003 RTCP XR Block for Burst/Gap Discard Metric Reporting
RFC 7004 RTCP XR Blocks for Summary Statistics Metrics Reporting
RFC 7005 RTCP XR Block for De-Jitter Buffer Metric Reporting
RFC 7022 Guidelines for Choosing RTP Control Protocol (RTCP) Canonical Names (CNAMEs)
RFC 7097 RTCP XR for RLE of Discarded Packets
RFC 7160 Support for Multiple Clock Rates in an RTP Session
RFC 7164 RTP and Leap Seconds
RFC 7198 Duplicating RTP Streams
RFC 7201 Options for Securing RTP Sessions
RFC 7202 Securing the RTP Framework: Why RTP Does Not Mandate a Single Media Security Solution
RFC 7243 RTCP XR Block for the Bytes Discarded Metric
RFC 7244 RTCP XR Blocks for Synchronization Delay and Offset Metrics Reporting
RFC 7266 RTCP XR Blocks for Mean Opinion Score (MOS) Metric Reporting
RFC 7273 RTP Clock Source Signalling
RFC 7294 RTCP XR Blocks for Concealment Metrics Reporting on Audio Applications
RFC 7380 RTCP XR Blocks for MPEG2 Transport Stream (TS) Program Specific Information (PSI) Decodability Statistics Metrics Reporting
RFC 7509 RTCP XR Blocks for Post-Repair Loss Count Metrics
RFC 7587 RTP Payload Format for the Opus Speech and Audio Codec
RFC 7667 RTP Topologies
RFC 7656 A Taxonomy of Semantics and Mechanisms for RTP Sources
RFC 7714 AES-GCM Authenticated Encryption in SRTP
RFC 7728 RTP Stream Pause and Resume
RFC 7741 RTP Payload Format for VP8 Video
RFC 7798 RTP Payload Format for High Efficiency Video Coding (HEVC)
RFC 7867 RTCP XR Blocks for Loss Concealment Metrics for Video Applications
RFC 7941 RTP Header Extension for RTCP Source Description Items
RFC 8022 Using Codec Control Messages in the RTP Audio-Visual Profile with Feedback with Layered Codecs
RFC 8083 Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions
RFC 8088 How to Write an RTP Payload Format
RFC 8108 Sending Multiple RTP Streams in a Single RTP Session
RFC 8285 A General Mechanism for RTP Header Extensions
RFC 8286 RTP/RTCP Extension for RTP Splicing Notification
RFC 8451 Considerations for Selecting RTCP XR Metrics for the WebRTC Statistics API
RFC 8627 RTP Payload Format for Flexible Forward Error Correction (FEC)

ECMA TC32 - PBX (QSIG) Interworking Standards
ECMA Document Title
ECMA-307 Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Generic Functional Protocol for the Support of Supplementary Services
ECMA-308 Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Call Transfer Supplementary Services
ECMA-309 Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Call Diversion Supplementary Services
ECMA-326 Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Call Completion Supplementary Services
ECMA-332 Corporate Telecommunication Networks - Signalling Interworking between QSIG and H.323 - Basic Services
ECMA-333 Private Integrated Services Network (PISN) - Mapping Functions for the Tunnelling of QSIG through H.323 Networks

This page is maintained by Paul E. Jones. Please feel free to report an errors directly to me.