Technical Manual
U-SYS MRS6100 Media Resource Server
Chapter 5 MGCP and SIP
Huawei Technologies Proprietary
5-38
Request
messages
Message meanings
REGISTER
MG registers to MGC.
OPTIONS
The OPTIONS request is used to query servers about their
capabilities.
II. Response messages
Response messages are used to respond to request messages, indicating the
success or failure of calls. Different classes of response messages are distinguished
by status codes. The status-code is a 3-digit integer. The first digit defines the class of
response. The last two digits describe the response in detail.
Table 5-11 shows the
classification of response messages and their meanings.
Table 5-11 Response messages
Serial
No.
Status-Code Message functions
1xx
Informational
(provisional)
Indicating the request message has been received
and is being processed
100 Trying
180 Ringing
181 Call Is being forwarded
182 Queued
2xx
Success
The action is successfully received, understood, and
accepted.
200 OK
3xx
Redirection
Further action needs to be taken in order to complete
the request.
300
Multiple choices
301
Moved permanently
302
Moved temporarily
303
See others
305
User proxy
380
Alternative service
4xx
Client error
The request contains Syntactical errors or cannot be
processed at this server.
400 Bad request
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