Technical Manual
U-SYS MRS6100 Media Resource Server
Chapter 5 MGCP and SIP
Huawei Technologies Proprietary
5-40
Serial
No.
Status-Code
Message functions
501
Not implemented
502
Invalid gateway
503
Service unavailable
504
Server time-out
505
Version not supported
513
Message too large
6xx Global
failure
The request cannot be fulfilled at any server.
600
All busy
603
Decline
604
Not exist anywhere
606
Not acceptable
Note:
Both the request and the response messages contain SIP fields and SIP message
fields.
SDP message fields are added into SIP messages.
5.3.5 Message Structure
I. Request messages
1) Request message format
A SIP request consists of the start line, message header, and message body. A line
feed character distinguishes each parameter line in the message header. Some
parameters are optional for different request messages, as shown in Figure 5-12.