Message Structure - Huawei U-SYS MRS6100 Technical Manual

Technical Manual
U-SYS MRS6100 Media Resource Server
Serial
No.
6xx
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.
Status-Code
501 Not implemented
502 Invalid gateway
503 Service unavailable
504 Server time-out
505 Version not supported
513 Message too large
Global failure The request cannot be fulfilled at any server.
600 All busy
603 Decline
604 Not exist anywhere
606 Not acceptable
Huawei Technologies Proprietary
Message functions
5-40
Chapter 5 MGCP and SIP