H323Feaures

• H.281 - "A FAR END CAMERA CONTROL PROTOCOL FOR VIDEOCONFERENCING USING H.224"

• Data support
  • H.224 - "A real time protocol for simplex applications using the H.221 LSD/HSD/MLP channels"

• Basic call handling

• H.245 : Control protocol for multimedia communication
• H.235 (more info TBA)
• H.450 (more info TBA)
• H.460 (more info TBA)

• DTMF support
  • RFC 2833/4733 - "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals"
  • 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"
• Partially implemented
  • RFC 3711 "The Secure Real-time Transport Protocol (SRTP)"

The Opal H.323 implementation supports the following standards:

• H.225.0 : Call signalling protocols and media stream packetization for packet-based multimedia communication systems
• H.245 : Control protocol for multimedia communication