Hi all,

I have an issue with SDP from Kamailio side in the following scenario: simple 
call from A to B.
When B answers a call and sends '200 OK' to A, A delays ACK for a while, so 
'200 OK' re-transmission happens.

After the fourth try to re-send '200 OK' towards A, Kamailio changes SDP 
(specifically connection information 'c', IP address become address of A 
instead of proxy IP as it was in the previous attempts). At some point A sends 
ACK and call is established, but last received '200 OK' has invalid SDP and it 
prevents successful media establishment.

I wonder if there any re-transmission counter or whatever what can affect this 
scenario and change SDP?

Roman Romanchenko
VoIP devel
Sipwise GmbH


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