Technical Manual
U-SYS MRS6100 Media Resource Server
Chapter 5 MGCP and SIP
Huawei Technologies Proprietary
5-52
the RTP audio/video application document. It means that all formats carried in the
session may be used, but the first one is the default format for the session.
The whole line indicates that A-law PCM single-channel audio signal is used by
default, its static payload type is numbered 8 in the RTP audio/video application
document, and the signal is transmitted to a UDP port 30000.
From the 20th line to 23rd line: These lines introduce rtpmap attributes, specifying
the mapping correspondence from RTP payload type to encoding. The format of such
a line is a: rtpmap:<payload type><encoding name>/<clock rate>[/<coding
parameter>]. In the format, coding parameter refers to the number of audio channels.
This parameter is unavailable to video signals.
II. Response messages
1) Response message format
Figure 5-13 shows the format for a SIP response. It is composed of a start line, a
message header, and a message body. A line feed character distinguishes each
parameter line in the message header. Some parameters are optional for different
response messages.
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