3Com VCX V7122 SIP VoIP Gateway User Manual 205A PPENDIX C: RTP/RTCP PAYLOAD TYPESAND P ORT A LLOCATIONRTP Payload Types are defined in RFC 1889 and RFC 1890. The gateways also have newpayload types to enable advanced use of other coder types. These types are reportedly notused by other applications.Payload Types Defined in RFC 1890Table 41 Packet Types Defined in RFC 1890Payload Type Description Basic Packet Rate [msec]0 G.711 μ-Law 10,202 G.726-32 10,204 G.723 (6.3/5.3 kbps) 308 G.711 A-Law 10,2018 G.729A 20200 RTCP Sender Report Randomly, approximately every 5 seconds (when packets aresent by channel)201 RTCP Receiver Report Randomly, approximately every 5 seconds (when channel isonly receiving)202 RTCP SDES packet203 RTCP BYE packet204 RTCP APP packetDefined Payload TypesTable 42 Defined Payload TypesPayload Type Description Basic Packet Rate [msec]35 G.726 32 kbps 2036 G.726 24 kbps 2038 G.726 40 kbps 20See the VCX V7122 & TP-1620 SIP Release Notes for the supported coders.
