Session Boarder controller (SBCE): No speechpath on Codec transcoding generate 200 OK without SDP for INVITE

Doc ID    SOLN310732
Version:    2.0
Status:    Published
Published date:    01 Sep 2020
Created Date:    07 Jun 2017
Author:   
Steffen Koberstaedt
 

Details

SCBE runs on 7.1.0.2-01-13249

Problem Clarification

Setup
There are 2 media rules configured on the SBCE.
One for provider, and one for internal network.
For the provider allow the g711, and allow transcode if required option.                 
Same for internal network, but the codec is g729.


The SDP part is changed in the INVITE message, but when the OK is comes from the CM trought the SM (with the SDP), the SBC forward it without SDP to the SP and it results in no speechpath

Cause

Configuratino issue on the interworking profile
The SBCE creates an PRACK

Solution

clone the default interworking profile


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