3Com VCX V7122/SIP VoIP Gateway User Manual
157
A
PPENDIX
B:
RTP/RTCP
P
AYLOAD
T
YPES
RTP Payload Types are defined in RFC 1889 and RFC 1890. 3Com has added new payload
types to enable advanced use of other coder types. These types are reportedly not used by
other applications.
See the VCX V7122/SIP Release Notes for the supported coders.
B.1
Payload Types Defined in RFC 1890
Table 30
Packet Types Defined in RFC 1890
Payload Type
Description
Basic Packet Rate [ms]
0 G.711
µ
-Law 5,10,20
2 G.726-32
20
4 G.723
(6.3/5.3
Kbps)
30
8 G.711
A-Law
5,10,20
18 G.729 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
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