On Mon, 2009-05-11 at 18:32 +0200, Francisco José Méndez Cirera wrote: > 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. _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
