One reason I can think of is due to backwards compatibility with RFC 2543, where from tag was not mandatory.
Thanks, Neel > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:sip-implementors- > [EMAIL PROTECTED] On Behalf Of Adarsh Guler > Sent: Thursday, April 26, 2007 7:13 AM > To: [email protected] > Subject: [Sip-implementors] callId in Dialog > > > HI, > > SIP says that Dialog is peer to peer relationship. > When INVITE is originated UA inserts From-tag , and in response the > other end UA inserts To-tag. > so here whats the use of Call-Id, when both of them has obtained > uniqueness.? > > Thanks & Regards > Adarsh. > > > > ========================================================================== > ================================================== > > Disclaimer: > > This message and the information contained herein is proprietary and > confidential and subject to the Tech Mahindra policy statement, you may > review at <a > href="http://www.techmahindra.com/Disclaimer.html";>http://www.techmahindra > .com/Disclaimer.html</a> externally and <a > href="http://tim.techmahindra.com/Disclaimer.html";>http://tim.techmahindra > .com/Disclaimer.html</a> internally within Tech Mahindra. > > ========================================================================== > ================================================== > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
