> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Scott Lawrence > Sent: Friday, December 05, 2008 6:16 PM > > A From Address will often fail to reach the caller if used as a request > target. >
Right - this was the same issue people had with Dan's return-routability test. > It is by no means assured that a SUBSCRIBE request will be > routed to the same set of UAs that an INVITE would be. In > particular, a SUBSCRIBE coming from outside the callers domain > may often be subject to policy based routing or rejected without > ever reaching the UA of even a legitimate caller. Correct - this was noted in an earlier email on this topic a few weeks ago as well. It's actually worse than that, BTW. We've already noted that the UAC would in fact have to support the dialog-event package; as would every b2bua in the middle that changed a call-id, and you'd have to hit all those same b2bua's. These all reduce the probability of a positive check result. (for some of us fairly drastically) > Even in > that case, it would indicate an unverified caller so often that the > callee would be unwise to make any firm judgment based on it, so the > callee is in exactly the position they are in today - the From address > is a hint. Exactly - that was my point about the Palin/Sarkozy problem not really being resolved. -hadriel _______________________________________________ Sip mailing list https://www.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
