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Implementation Issues (1/6)

Implementation Issues (1/6). TSAP Ids used by H.225.0 per point-to-point unicast call. Usage of TSAP IDs. Reliable or Unreliable. Well known or dynamic. Audio/RTP. Unreliable. Dynamic. Audio/RTCP. Unreliable. Dynamic. Video/RTP. Unreliable. Dynamic. Video/RTCP. Unreliable. Dynamic.

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Implementation Issues (1/6)

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  1. Implementation Issues (1/6) TSAP Ids used by H.225.0 per point-to-point unicast call Usage of TSAP IDs Reliable or Unreliable Well known or dynamic Audio/RTP Unreliable Dynamic Audio/RTCP Unreliable Dynamic Video/RTP Unreliable Dynamic Video/RTCP Unreliable Dynamic Call Signalling Reliable Well known or dynamic H.245 Reliable Dynamic Data(T.120) Reliable Well known or dynamic RAS Unreliable Well known or dynamic Amy, Mei-Hsuan Lu CML/CSIE/NTU

  2. Implementation Issues (2/6) Unreliable delivery application Call Signalling and H.245 channel UDP TCP IP Link Layer Physical Layer Amy, Mei-Hsuan Lu CML/CSIE/NTU

  3. Implementation Issues (3/6) • Discovery the Gatekeeper • Gatekeeper UDP Discovery Multicast Address 224.0.1.41 • Gatekeeper UDP Discovery 1718 • Gatekeeper Registration and Status Port 1719 • Endpoint to Endpoint Communication • Endpoint TCP Call Signalling Port 1720 • While it is permitted to use dynamic values for these ports to allow multiple endpoints in a single device ?? Amy, Mei-Hsuan Lu CML/CSIE/NTU

  4. Implementation Issues (4/6) • When messages are sent on the reliable H.245 control channel, more than one message may be sent in a single packet as long as whole messages are sent; there shall be no fragmentation of H.245 messages across packets Amy, Mei-Hsuan Lu CML/CSIE/NTU

  5. Implementation Issues (5/6) • RTP data in an IP packet IP header UDP header RTP header RTP payload • For saving bandwidth, multiple RTCP message may contain in one UDP packet Amy, Mei-Hsuan Lu CML/CSIE/NTU

  6. Implementation Issues (6/6) • Unless otherwise specified, the aligned variant PER encoding of ASN.1 shall be used for all ASN.1 specified in H.225. • The encoding rule of Call Signalling Messages are specified in Q.931 Amy, Mei-Hsuan Lu CML/CSIE/NTU

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