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Don't go the ringing state until we really get the 180 response. Log potetial re-INVITEs. Simpler version of SIPEngine::sameINVITE just checks CSeq, on the assumption that CallID already matched when we searched the transaction table. Faster and does not rely on string conversion. git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@4347 19bc5d8c-e614-43d4-8b26-e1612bc8e597