Re: [RFC 4235 & draft-kuthan-sip-derive] 481 "Call doesn't exist" for initial SUBSCRIBE ?
Dean Willis <[email protected]>
| Newsgroups | gmane.ietf.sip |
|---|---|
| Message-ID | <[email protected]> |
On Oct 31, 2008, at 12:54 PM, [email protected] wrote: > From: "=?UTF-8?Q?I=C3=B1aki_Baz_Castillo?=" <[email protected]> > >> In any case, for the purposes of DERIVE, none of that matters: >> Any failure response to the SUBSCRIBE, or a NOTIFY that does not >> list the call in question, results in call rejection. > > But this behaviour would deny calls from devices not supporting > RFC4235 (receiving a SUBSCRIBE Event: dialog).AFAIK this draft says > that if the SUBSCRIBE is replied with 200 thenthe dialog exists and > identity verified, if 481 then the devicesupports RFC 4235 and it's > a suspicius call, and for any other failureroute it could mean that > the device doesn't support RFC 4235 or anykind of "protection" in > an intermediary proxy. In the last case, thereceptor of the INVITE > should choose to accept or deny the call, hecannot know if the > sender is really the From (or if he is not). clearly one needs a Supported option-tag in the initial request to let the called party know that it might be reasonable to try to RRC using DERIVE. -- Dean _______________________________________________ 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