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Knowledge Base

FAQ-SBC don't forward the message

Publication Date:  2012-08-09  |   Views:  625  |   Downloads:  0  |   Author:  hubo  |   Document ID:  EKB0000547442


Issue Description

Why SBC don' forward the message ?
Current version:  V200R008C05SPC100
Current network setup:
During the session being established , the 18X and 200 OK message which send by called users can't be forwarded to the caller through SBC (SE2600).

Alarm Information


Handling Process

Run this command
sbc sip compatible fix-port enable 
This command  force the port with 5060.

Root Cause

sbc as a interconnection server, it is able to modify the sip message which from one side and forward the message to the other side. when the first invite message of the caller arrival  (the figure 1)  ,sbc process the message, and the important action is replacing and saving the field of FROM which a part of the invite message with the softx ip address and the softx port. But at the end, sbc forwarded the modified invite message  to the other side with a wrong port, the correct port is 5060 not 9135.(the figure 2)

                                                                                        figure 1

                                                                                          figure 2