[OpenSIPS-Users] Problem on an Interco where remote SIP proxy is expecting "Route:" header to be filled information from the last "Contact:" header ?

[Julien Chavanton]

I was working on one interco problem with a remote SIP proxy running on Kamailio.
 
Cisco(U1) --> Opensips(P1) --> Internet --> Kamailio(P2) --> Asterisk(U2)
 
The remote proxy(P2) is expecting us to fill the "Route:" header taking information from the "Contact:" header, according to my research the "Route:" header as to be filled using the information found in the last "Record-route:" header.
 
Note that the "Contact:" header IP address is the one of U2, as it is the destination UA.
 
I think our partner using Kalamailio only interconnected UA not Proxy, since they never faced this problem.
 
I will have to contact the technicien that as configured there Kalamailio server to validate why face this behavior.
 
 
--------------------------------------------------------------------------
 
" 16.12.1.3 Rewriting Record-Route Header Field Values "
http://www.ietf.org/rfc/rfc3261.txt
--------------------------------------------------------------------------
 
I used a hardcoded ACK  to make it work until we reach the butom of this, where we hardcoded the replacement of the IP address in the "Route:" header
 
subst('/^Route: <sip:P2;(.*)$/Route: <sip:U2;\1/');
 
 
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