1. 1996/2/13Amy, Mei-Hsuan Lu CML/CSIE/NTU1 Implementation Issues (1/6) Usage of TSAP IDs Reliable or Unreliable Well known or dynamic Audio/RTPUnreliableDynamic Audio/RTCPUnreliableDynamic Video/RTPUnreliableDynamic Video/RTCPUnreliableDynamic Call Signalling Reliable Well known or dynamic H.245ReliableDynamic Data(T.120)Reliable RASUnreliable TSAP Ids used by H.225.0 per point-to-point unicast call

2. 1996/2/13Amy, Mei-Hsuan Lu CML/CSIE/NTU2 Implementation Issues (2/6) Unreliable delivery application Call Signalling and H.245 channel UDPTCP IP Link Layer Physical Layer

3. 1996/2/13Amy, Mei-Hsuan Lu CML/CSIE/NTU3 Implementation Issues (3/6) ä Discovery the Gatekeeper ä Gatekeeper UDP Discovery Multicast Address 224.0.1.41 ä Gatekeeper UDP Discovery 1718 ä Gatekeeper Registration and Status Port 1719 ä Endpoint to Endpoint Communication ä Endpoint TCP Call Signalling Port 1720 ä While it is permitted to use dynamic values for these ports to allow multiple endpoints in a single device ??

4. 1996/2/13Amy, Mei-Hsuan Lu CML/CSIE/NTU4 Implementation Issues (4/6) ä 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

5. 1996/2/13Amy, Mei-Hsuan Lu CML/CSIE/NTU5 Implementation Issues (5/6) ä RTP data in an IP packet IP header UDP header RTP header RTP payload ä For saving bandwidth, multiple RTCP message may contain in one UDP packet

6. 1996/2/13Amy, Mei-Hsuan Lu CML/CSIE/NTU6 Implementation Issues (6/6) ä Unless otherwise specified, the aligned variant PER encoding of ASN.1 shall be used for all ASN.1 specified in H.225. ä The encoding rule of Call Signalling Messages are specified in Q.931