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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 2327 "SDP: Session Description Protocol"
  • RFC 1889/3550 "RTP: A Transport Protocol for Real-Time Applications"
  • RFC 1890/3551 "RTP Profile for Audio and Video Conferences with Minimal Control"
  • RFC 3555 "MIME Type Registration of RTP Payload Formats"
  • RFC 3960 "Early Media and Ringing Tone Generation in 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 transfer support (blind/consult)
  • RFC 3515 "The Session Initiation Protocol (SIP) Refer Method"
  • RFC 3891 "The Session Initiation Protocol (SIP) 'Replaces' Header"
  • RFC 4488 "Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription"
• DTMF support
  • RFC 2833/4733 - "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 and video
  • 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 GSM plugin)
  • Speex audio codec as per draft-ietf-avt-rtp-speex-05 (via GSM plugin)
  • RFC 2032/4587 "RTP Payload Format for H.261 Video Streams" (via IPP plugin)
  • RFC 2190 "RTP Payload Format for H.263 Video Streams" (via FFmpeg plugin)
  • RFC 2429/4629 "RTP Payload Format for the 1998 Version of ITU-T Rec. H.263 Video (H.263+)" (via FFmpeg plugin)
  • RFC 3016 "RTP Payload Format for MPEG-4 Audio/Visual Streams" (via IPP plugin)
  • RFC 3952 "Real-time Transport Protocol (RTP) Payload Format for internet Low Bit Rate Codec (iLBC) Speech" (via iLBC plugin)
  • RFC 3984 "RTP Payload Format for H.264 Video" (via IPP plugin)
  • RFC 4175 "RTP Payload Format for Uncompressed Video"
  • RFC 5168 "XML Schema for Media Control" (video update only)
• Data support
  • 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"
  • H.281 - "A FAR END CAMERA CONTROL PROTOCOL FOR VIDEOCONFERENCING USING H.224"
• Miscellaneous
  • RFC 3265 "Session Initiation Protocol (SIP)-Specific Event Notification"
  • RFC 3428 "Session Initiation Protocol (SIP) Extension for Instant Messaging"
  • 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 3842 "A Message Summary and Message Waiting Indication Event Package for the Session Initiation Protocol (SIP)"
  • RFC 3856 "A Presence Event Package for the Session Initiation Protocol (SIP)."
  • RFC 3857 "A Watcher Information Event Template-Package for the Session Initiation Protocol (SIP)."
  • RFC 3890 "A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP)"
  • RFC 4103 "RTP Payload for Text Conversation"
  • RFC 4235 "An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol (SIP)"
  • draft-anil-sipping-bla-03.txt "Implementing Bridged Line Appearances (BLA) Using Session Initiation Protocol (SIP)"
  • draft-anil-sipping-bla-04.txt "Implementing Bridged Line Appearances (BLA) Using Session Initiation Protocol (SIP)"
• Partially implemented
  • RFC 3711 "The Secure Real-time Transport Protocol (SRTP)"
  • RFC 3863 "Presence Information Data Format."
  • RFC 4480 "RPID: Rich Presence Extensions to the Presence Information Data Format (PIDF)"
  • RFC 4573 "MIME Type Registration for RTP Payload Format for H.224"
  • RFC 4975 "The Message Session Relay Protocol (MSRP)"
• Not implemented
  • RFC 3262 "Reliability of provisional responses in Session Initiation Protocol (SIP)."
  • RFC 3323 "A Privacy Mechanism for the Session Initiation Protocol (SIP)"
  • RFC 3611 "RTP Control Protocol Extended Reports (RTCP XR)"
  • RFC 3903 "Session Initiation Protocol (SIP) Extension for Event State Publication."
  • RFC 3959 "The Early Session Disposition Type for the Session Initiation Protocol (SIP)"
  • RFC 4351 "Real-Time Transport Protocol (RTP) Payload for Text Conversation Interleaved in an Audio Stream"
  • RFC 4796 "The Session Description Protocol (SDP) Content Attribute";
  • RFC 4976 "Relay Extensions for the Message Session Relay Protocol (MSRP)"