Huawei U-SYS MRS6100 Technical Manual page 45

Technical Manual
U-SYS MRS6100 Media Resource Server
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The 7 line: c in the response identifies the connection information. IN refers to
network type in the form of a text string. The currently defined IN is Internet. IP4
indicates the type of connection address is IP4. 182.20.40.4 represents the network
address of the remote gateway of MRS that has a connection with the MGC.
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The 8 line: Media description. audio indicates the type of media is audio. (audio is
used for audio connections, and nas is used for data access.) 30002 is the number of
transport layer port to which media streams are transmitted. RTP/AVP is the transport
layer protocol. Its value is associated with the type of address in the c line. For IP4, a
great number of media service streams are transferred over RTP/UDP. There are two
classes of protocols defined: RTP/AVP, audio/video application document,
transported over UDP; Udp, the DUP protocol. At this time, the mapping relation from
RTP payload type to encoding is that 8 corresponds to the media encoding format
PCMA.
II. Responses
1) Response format
Similar to the format of MGCP commands, the response format is composed of a
response line followed by a group of optional parameter lines. The response line
consists of the response code, transaction identifier and an optional commentary that
is separated by a space, as shown in Figure 5-6. The response code is a three-digit
numeric value, indicating the execution status of the command.
Response code
Figure 5-6 Structure of MGCP response
2) Response parameters
The response parameter lines are optional and depend on the specific commands.
For more information, refer to the section "Command parameters", earlier in this
chapter.
3) Response expressions
What are within the parenthesis preceded by the command name are response
parameter values. Those enclosed by brackets are optional.
EndpointConfiguration
EPCF (ReturnCode)
NotificationRequest
Transaction ID Comment (optional)
Parameter name: value
Parameter name: value
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5-20
Chapter 5 MGCP and SIP
MML
Parameter line