From OpalVoipWiki

Main: SIPFeatures

The Opal SIP implementation supports the following standards:

• Basic SIP call handling
  • RFC 3261 "SIP: Session Initiation Protocol"
    • Registrar support
    • Simultaneous Registration to Several Accounts
    • Proxy Support
    • Outbound Proxy Support
  • RFC 2617 "HTTP Authentication: Basic and Digest Access Authentication"
  • RFC 3262 "Reliability of provisional responses in Session Initiation Protocol (SIP)"
  • RFC 3263 "Session Initiation Protocol (SIP): Locating SIP Servers"
  • RFC 3550/1889 "RTP: A Transport Protocol for Real-Time Applications"
  • RFC 3551/1890 "RTP Profile for Audio and Video Conferences with Minimal Control"
  • RFC 3555 "MIME Type Registration of RTP Payload Formats"
  • RFC 3581 "An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing"
  • RFC 3960 "Early Media and Ringing Tone Generation in SIP"
  • RFC 4566/2327 "SDP: Session Description Protocol"
  • RFC 5245 "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols" (Lite only)
  • RFC 6455 "The WebSocket Protocol"
  • RFC 7118 "The WebSocket Protocol as a Transport for the Session Initiation Protocol (SIP)"
• Re-Invite support as per RFC 3264 "An Offer/Answer Model with the Session Description Protocol (SDP)" including:
  • Call hold and resume by adding/removing media streams
  • Codec change by re-INVITE
• Call control support (PBX/telephony emulation, e.g. blind/consult transfer etc)
  • RFC 3515 "The Session Initiation Protocol (SIP) Refer Method"
  • RFC 3842 "A Message Summary and Message Waiting Indication Event Package for the Session Initiation Protocol (SIP)"
  • RFC 3890 "A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP)"
  • RFC 3891 "The Session Initiation Protocol (SIP) 'Replaces' Header"
  • RFC 3892 "The Session Initiation Protocol (SIP) Referred-By Mechanism"
  • RFC 4235 "An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol (SIP)"
  • RFC 4488 "Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription"
  • draft-anil-sipping-bla-04.txt "Implementing Bridged Line Appearances (BLA) Using Session Initiation Protocol (SIP)"
  • Cisco "Remote-Party-ID" SIP header for tracking transfers.
• Media & RTP
  • RFC 3605 "Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)"
  • RFC 3711 "The Secure Real-time Transport Protocol (SRTP)"
  • RFC 3388 "Grouping of Media Lines in the Session Description Protocol (SDP)"
  • RFC 4568 "Session Description Protocol (SDP) Security Descriptions for Media Streams"
  • RFC 4574 "The Session Description Protocol (SDP) Label Attribute"
  • RFC 4585 "Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF)"
  • RFC 5576 "Source-Specific Media Attributes in the Session Description Protocol (SDP)"
  • RFC 5761 "Multiplexing RTP Data and Control Packets on a Single Port"
  • RFC 5764 "Datagram Transport Layer Security (DTLS) Extension to Establish Keys for the Secure Real-time Transport Protocol (SRTP)"
• DTMF support
  • RFC 4733/2833 - "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals"
  • RFC 2976 - "The SIP Info Method"
    • Support for Cisco SIP INFO application/dtmf-relay
    • Support for SIP INFO application/dtmf
  • In-band DTMF detection/generation (where possible)
• Audio
  • G.711 uLaw and ALaw audio
  • Standard GSM 06.10 audio (via GSM plugin)
  • Microsoft GSM audio as per draft-ema-vpim-msgsm-00.txt (via plugin)
  • Speex audio codec as per draft-ietf-avt-rtp-speex-05 (via plugin)
  • RFC 3952 "Real-time Transport Protocol (RTP) Payload Format for internet Low Bit Rate Codec (iLBC) Speech" (via plugin)
  • RFC 4867/3267 "RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs" (via plugin)
  • RFC 3611 "RTP Control Protocol Extended Reports (RTCP XR)"
• Video
  • RFC 2190 "RTP Payload Format for H.263 Video Streams" (via plugin)
  • RFC 3016 "RTP Payload Format for MPEG-4 Audio/Visual Streams" (via plugin)
  • RFC 3984 "RTP Payload Format for H.264 Video" (via plugin)
  • RFC 4175 "RTP Payload Format for Uncompressed Video"
  • RFC 4587/2032 "RTP Payload Format for H.261 Video Streams" (via plugin)
  • RFC 4629/2429 "RTP Payload Format for the 1998 Version of ITU-T Rec. H.263 Video (H.263+)" (via plugin)
  • RFC 4796 "The Session Description Protocol (SDP) Content Attribute";
  • RFC 5104 "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)" (partial, video update & TSTO only)
  • RFC 5168 "XML Schema for Media Control" (partial, video update only)
• Data support
  • T.38 - "Procedures for real-time Group 3 facsimile communication over IP networks"
  • RFC 3362 "Real-time Facsimile (T.38) - image/t38 MIME Sub-type Registration"
  • H.224 - "A real time protocol for simplex applications using the H.221 LSD/HSD/MLP channels" (partial)
  • H.281 - "A FAR END CAMERA CONTROL PROTOCOL FOR VIDEOCONFERENCING USING H.224" (partial)
  • RFC 4573 "MIME Type Registration for RTP Payload Format for H.224" (partial)
• Presence & Instant Messaging
  • RFC 3428 "Session Initiation Protocol (SIP) Extension for Instant Messaging"
  • RFC 3680 "A Session Initiation Protocol (SIP) Event Package for Registrations"
  • RFC 3856 "A Presence Event Package for the Session Initiation Protocol (SIP)."
  • RFC 3861 "Address Resolution for Instant Messaging and Presence"
  • RFC 3863 "Presence Information Data Format."
  • RFC 3903 "Session Initiation Protocol (SIP) Extension for Event State Publication"
  • RFC 3994 "Indication of Message Composition for Instant Messaging"
  • RFC 4103 "RTP Payload for Text Conversation"
  • RFC 4480 "RPID: Rich Presence Extensions to the Presence Information Data Format (PIDF)" (partial)
  • RFC 4662 "A Session Initiation Protocol (SIP) Event Notification Extension for Resource Lists"
  • RFC 4825 "The Extensible Markup Language (XML) Configuration Access Protocol (XCAP)"
  • RFC 4826 "Extensible Markup Language (XML) Formats for Representing Resource Lists"
  • RFC 4827 "An Extensible Markup Language (XML) Configuration Access Protocol (XCAP) Usage for Manipulating Presence Document Contents"
  • RFC 4975 "The Message Session Relay Protocol (MSRP)" (partial, very partial)
  • RFC 5025 "Presence Authorization Rules"
  • RFC 5367 "Subscriptions to Request-Contained Resource Lists in the Session Initiation Protocol (SIP)" (partial)
  • RFC 5438 "Instant Message Disposition Notification (IMDN)" (partial)
• Miscellaneous
  • RFC 2396 "Uniform Resource Identifiers (URI): Generic Syntax"
  • RFC 3265 "Session Initiation Protocol (SIP)-Specific Event Notification"
  • RFC 3325 "Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks" (partial)
  • RFC 3489 "STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)"
  • RFC 3581 "An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing"
  • RFC 3857 "A Watcher Information Event Template-Package for the Session Initiation Protocol (SIP)"
  • RFC 3858 "An Extensible Markup Language (XML) Based Format for Watcher Information"
  • RFC 3966 "The tel URI for Telephone Numbers"
  • RFC 4282/2486 "The Network Access Identifier"
  • RFC 5766 "Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN)" (partial)
• Not yet implemented
  • RFC 3311 "The Session Initiation Protocol (SIP) UPDATE Method"
  • RFC 3312 "Integration of Resource Management and Session Initiation Protocol (SIP)"
  • RFC 3313 "Private Session Initiation Protocol (SIP) Extensions for Media Authorization"
  • RFC 3323 "A Privacy Mechanism for the Session Initiation Protocol (SIP)"
  • RFC 3327 "Session Initiation Protocol (SIP) Extension Header Field for Registering Non-Adjacent Contacts"
  • RFC 3326 "The Reason Header Field for the Session Initiation Protocol (SIP)"
  • RFC 3389 "Real-time Transport Protocol (RTP) Payload for Comfort Noise (CN)" (though could be done by user plug in)
  • RFC 3455 "Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP)"
  • RFC 3524 "Mapping of Media Streams to Resource Reservation Flows"
  • RFC 3608 "Session Initiation Protocol (SIP) Extension Header Field for Service Route Discovery During Registration"
  • RFC 3840 "Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)"
  • RFC 3841 "Caller Preferences for the Session Initiation Protocol (SIP)"
  • RFC 3911 "The Session Initiation Protocol (SIP) "Join" Header"
  • RFC 3959 "The Early Session Disposition Type for the Session Initiation Protocol (SIP)"
  • RFC 4028 "Session Timers in the Session Initiation Protocol (SIP)"
  • RFC 4351 "Real-Time Transport Protocol (RTP) Payload for Text Conversation Interleaved in an Audio Stream"
  • RFC 4483 "A Mechanism for Content Indirection in Session Initiation Protocol (SIP) Messages"
  • RFC 4902 "Representing Trunk Groups in tel/sip Uniform Resource Identifiers (URIs)"
  • RFC 4976 "Relay Extensions for the Message Session Relay Protocol (MSRP)"
  • RFC 5263 "Session Initiation Protocol (SIP) Extension for Partial Notification of Presence Information"