User`s manual

SIP User's Manual E. RTP/RTCP Payload Types and Port Allocation
Version 5.0 365 October 2006
E RTP/RTCP Payload Types and Port
Allocation
RTP Payload Types are defined in RFC 3550 and RFC 3551. We have added new payload
types to enable advanced use of other coder types. These types are reportedly not used by
other applications.
E.1 Payload Types Defined in RFC 3551
Table E-1: Packet Types Defined in RFC 3551
Payload Type Description Basic Packet Rate [msec]
0 G.711 µ-Law 10,20
2 G.726-32 10,20
3 GSM-FR 20
4 G.723 (6.3/5.3 kbps) 30
8 G.711 A-Law 10,20
18 G.729A/B 20
200 RTCP Sender Report
Randomly, approximately every 5 seconds (when
packets are sent by channel)
201 RTCP Receiver Report
Randomly, approximately every 5 seconds (when
channel is only receiving)
202 RTCP SDES packet
203 RTCP BYE packet
204 RTCP APP packet
E.2 Defined Payload Types
Table E-2: Defined Payload Types
Payload Type Description Basic Packet Rate [msec]
3 MS-GSM 40
3 GSM-EFR 20
51 NetCoder 6.4 kbps 20
52 NetCoder 7.2 kbps 20
53 NetCoder 8.0 kbps 20
54 NetCoder 8.8 kbps 20
56 Transparent PCM 20
60 EVRC 20
64 AMR 20
96 DTMF relay per RFC 2833
102 Fax Bypass 20
103 Modem Bypass 20
104 RFC 2198 (Redundancy) Same as channel’s voice coder.
105 NSE Bypass