Given the following scenario with Kamailio and rtpengine in the middle:

-  call establishes with G.711 RTP

-  b-leg re-invites to T.38, indicating a different port number then he is using for G.711

-  a-leg refuses the re-invite with a 488

-  call continues using G.711 on original port numbers as if re-invite never happened

Will Kamailio and rtpengine handle it?

Today I have a functional configuration with rtpproxy on another SIP proxy.  It handles every scenario I have tried except this one.  rtpproxy sees the new ports in the re-invite and adjusts its session accordingly.  If the re-invite is rejected, the old media ports are no longer valid through rtpproxy, and the call fails.

Is there an approach I can take with Kamailio and rtpengine to allow this scenario to succeed?

Regards,

Jeff