At SIPIT11, we found an issue when we want to configure a local outbound proxy using the procedures specified in rfc3261(sec 8.1.2).
Here is a sample INVITE which we send :- INVITE sip:1.2.3.4:5060 SIP/2.0 To:ua1<sip:[EMAIL PROTECTED]:5060> From:sipit1<sip:[EMAIL PROTECTED]>;tag=52792329608rc880 Call-ID:130920245025z2qi CSeq:2 INVITE Via:SIP/2.0/UDP 65.243.118.179:5060;branch=z9hG4bK56241282309bvhjg Contact:sip:65.243.118.179 Route:ua1<sip:[EMAIL PROTECTED]:5060> We found that some implentations that didn't support loose-routing, never looked at the topmost ROUTE header for determining the target set. They just look at the request-uri which would be that of the proxy itself, since it is a strict-router. So the proxy responds with 404, as the user part was missing in the request-uri. Is this a backward compatibility problem with older proxies? Regards... Vijay
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