From: Paul Kyzivat <[EMAIL PROTECTED]> However I am still scratching my head about the UAS sending a 199. While I see no reason to forbid it I'm trying to find a situation when it would be helpful. The only case I have been able to think of is:
I admit I hadn't considered whether a UAS sending 199 is useful. But in giving the rules for proxies, we must take care of the case where a downstream proxy sends a 199. This is where we get the rule that if a proxy propagates a 199 for an early dialog, then it should not send a 199 for that early dialog itself. Once we've set that rule for proxies, then a UAS can also send a 199 without breaking anything. But it does look like there is no gain from sending a 199 unless the corresponding final response will not be sent immediately. Dale _______________________________________________ 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
