Its entirely up to you. The RFCs specify protocols, not end user behavior, and as far as SIP is concerned a B2BUA is an automated end user who chooses to place an outgoing call whenever it gets an incoming call. As long as each individual call the B2BUA participates in conforms faithfully to the appropriate RFCs, there are no rules governing how similar or disimilar the calls should be with regard to details that are properly under the control of the end user, like the exact choice of Call ID string. Do whatever works, whatever is easiest, and whatever makes your (human) end users happiest.
Caveat: of course, you do want to make sure that the things that are supposed to be globally unique stay globally unique . . . -John Gregg -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Avasarala Ranjit-A20990 Sent: Tuesday, May 10, 2005 11:00 AM To: [EMAIL PROTECTED]; sip-implementors@cs.columbia.edu Subject: RE: [Sip-implementors] Query in Call-ID Field Hi If B2BUA forwards the INVITE (F1) as (F2), then Call-Ids could be same. But if B2BUA is generating a new INVITE on behalf of SIP phone to the trunk gateway, then call id for F2 could be different from that of F1. Regards Ranjit -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, May 10, 2005 8:45 AM To: sip-implementors@cs.columbia.edu Subject: [Sip-implementors] Query in Call-ID Field Dear Sip-implementors, After receiving a INVITE (F1) request from a SIP phone, the B2BUA sends a INVITE (F2)request to the trunk gateway for an external call. I would like to know whether these 2 INVITE request (both F1 and F2) should have the same Call-ID or not. Regards _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
