El 11/05/2009, a las 18:56, "Scott Lawrence" <scott.lawre...@nortel.com> escribió:
> On Mon, 2009-05-11 at 18:32 +0200, Francisco José Méndez Cirera wrot > e: >> A question about the CALL-ID. >> >> 1. UAC sends an INVITE request to Redirect Server with CALL-ID: >> abc. >> 2. Redirect server sends response "300 Multiples Choices". >> 3. UAC makes a pararell search sending three INVITES with CALL-ID: >> ¿abc?. >> >> I dont understand why first INVITE and three last INVITES have the >> same >> CALL-ID... >> >> The CALL-ID definition for a new request outside dialog is (section >> 8.1.1): >> >> "In a new request created by a UAC outside of any dialog, the Call- >> ID header >> field MUST be selected by the UAC as a globally unique identifier >> over space >> and time unless overriden by method-specific behavior. >> >> I think that last three INVITES should have diferent CALL-ID, >> because they >> are new request created outside the dialog. Moreover, the first >> INVITE did >> not make a session or a dialog, therefore I think that CALL-ID >> should have >> another value. >> >> Although in the same section you can read: >> >> "Note than when a request are retried after a certain failure >> responses that >> solicit an amendment to a request (for example, a challenge for >> authentication), these retried request are not considered new >> request, and >> therefore do not need new CALL-ID header fields" >> >> Does this solve my question? >> >> Is it possible that the UAC considers the three INVITES belonging >> to same >> session that the first INVITE was? > > They are new branches for the same call. The branch id on the Via > should be new, but the call-id and the from tag should be the same. Really a session (call) is established? If a session is established with first INVITE, I understand that the CALL-ID MUST be same. Thanks. _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
