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From: | David Ramirez |
Subject: | [osip-dev] INVITE Server transaction - matching requests |
Date: | Wed, 11 Sep 2013 13:48:35 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130820 Icedove/17.0.8 |
Hi, There is a non-compliant behavior when matching INVITE requests in IST state machine. As stated in RFC3261 17.2.3: The INVITE request matches a transaction if the Request-URI, To tag, From tag, Call-ID, CSeq, and top Via header field match those of the INVITE request which created the transaction. In file "src/osip2/osip_transaction.c" the function you can find the following code: __osip_transaction_matching_request_osip_to_xist_17_2_3 (osip_transaction_t * tr, osip_message_t * request) ... if (MSG_IS_ACK (request)) { [...] } else { if (0 != osip_to_tag_match (tr->to, request->to)) return OSIP_UNDEFINED_ERROR; The function osip_to_tag_match() may return a wrong return code when INVITE retransmission is received. The "request->to" will ever be empty (as it is an INVITE request), however "tr->to" may have a value if the user has already sent a response that includes To tag. The above sentence should be replaced by the following sentence in order to avoid that behaviour: osip_to_tag_match (tr->orig_request->to, request->to)This sentence will match, as every INVITE will lack the To tag, and it fits accurately to the RFC. Regards, David --
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