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Mediant 2000 SIP User’s Manual C. RTP/RTCP Payload Types and Port Allocation
Version 4.4 201 July 2005
Appendix C RTP/RTCP Payload Types and Port
Allocation
RTP Payload Types are defined in RFC 1889 and RFC 1890. We have added new payload types
to enable advanced use of other coder types. These types are reportedly not used by other
applications.
Note: Refer to the Mediant 2000 & TP-1620 SIP Release Notes for the supported
coders.
C.1 Payload Types Defined in RFC 1890
Table C-1: Packet Types Defined in RFC 1890
Payload Type Description Basic Packet Rate [msec]
0 G.711 µ-Law 10,20
2 G.726-32 10,20
4 G.723 (6.3/5.3 kbps) 30
8 G.711 A-Law 10,20
18 G.729A 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
C.2 Defined Payload Types
Table C-2: Defined Payload Types (continues on pages 201 to 202)
Payload Type Description Basic Packet Rate [msec]
35 G.726 32 kbps 20
36 G.726 24 kbps 20
38 G.726 40 kbps 20
39 G.727 16 kbps 20
40 G.727 24-16 kbps 20
41 G.727 24 kbps 20
42 G.727 32-16 kbps 20
43 G.727 32-24 kbps 20
44 G.727-32 kbps 20
45 G.727 40-16 kbps 20
46 G.727 40-24 kbps 20
47 G.727 40-32 kbps 20
49 NetCoder 4.8 kbps 20
50 NetCoder 5.6 kbps 20
51 NetCoder 6.4 kbps 20
52 NetCoder 7.2 kbps 20