3Com VCX V7122 SIP VoIP Gateway User Manual206Payload Type Description Basic Packet Rate [msec]39 G.727 16 kbps 2040 G.727 24-16 kbps 2041 G.727 24 kbps 2042 G.727 32-16 kbps 2043 G.727 32-24 kbps 2044 G.727-32 kbps 2045 G.727 40-16 kbps 2046 G.727 40-24 kbps 2047 G.727 40-32 kbps 2049 NetCoder 4.8 kbps 2050 NetCoder 5.6 kbps 2051 NetCoder 6.4 kbps 2052 NetCoder 7.2 kbps 2053 NetCoder 8.0 kbps 2054 NetCoder 8.8 kbps 2055 NetCoder 9.6 kbps 2056 Transparent PCM 2096 DTMF relay per RFC 2833102 Fax Bypass 20103 Modem Bypass 20104 RFC 2198 (Redundancy) Same as channel’s voice coder.105 NSE BypassDefault RTP/RTCP/T.38 Port AllocationTable 43 Default RTP/RTCP/T.38 Port AllocationChannel Number RTP Port RTCP Port T.38 Port1 6000 6001 60022 6010 6011 60123 6020 6021 6022
