HI all, Can we have different session identifiers for one session?? Scenario: For INVITE (Offer) im getting 200 OK (Answer). And it will have one session id at "o" line in sdp. I will send re-INVITE with different session id. Is it possible??? In RFC they have suggested to use unique identifier for session, But some sip hard phones are sending different session id's is it possible??? Plz suggest how to handle this scenario. Thanks, Vikas C.G.