HI, I have a basic doubt about invite session and reinvite . I am writing a B2B UA . I need to carry all the requests from one leg to the other leg . When the UA gets a reinvite , will the application gets this reINVITE (when we use invite session)so that , the application can forward this reinvite to the other leg . Could you please let me know whether using inivite sessions for this purpose is ok ,for handling INVITE requests in a B2B mode ? Or Is it better to use UA library with out invite session. with thanks and regards Mahesh