On Mon, 2009-03-23 at 08:18 -0700, Brett Tate wrote: > Everyone: Is REFER within dialog part of INVITE usage, SUBSCRIPTION > usage, or neither? > > I'm asking mainly because of REFER 481 impacts; however the answer > also has potential implications concerning draft-ietf-sip-info-events. > RFC 5057 appears to imply that it is part of the subscription usage; > however I'm not positive if my interpretation and/or RFC 5057 is > correct. > > If REFER isn't considered part of the INVITE usage, how should REFER > 481 be interpreted? More specifically, should receiver of REFER 481 > send BYE?
I would argue that the REFER is part of the INVITE usage, because REFER in that context is intimately related to the INVITE usage -- it is intended to transfer the INVITE usage/dialog transferred to a different destination. And it seems quite safe that if the REFER receives a 481 response, the INVITE usage must not be functional any more, since the far end of that usage has denied that it can act on the REFER. Now it's possible that the REFER, if it is successful, is the first transaction of the subscription usage. But I don't think that has any paradoxical consequences, as by hypothesis, the REFER succeeded. 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
