Forget the RFC id , RFC3323 -----Original Message----- From: Rockson Li (zhengyli) Sent: Friday, June 20, 2008 5:04 PM To: '[EMAIL PROTECTED]' Cc: '[email protected]' Subject: Re: [Sip] Regarding provisional responses to SIP requests
Hi Brijesh, For RFC3261-complianet UA, this can be done, the main concern over this modification is dialog matching. RFC2543 use whole from/to/call-id header to match dialog, whereas, RFC3261 uses only from tag / to tag/call-id So we can find in RFC sec5.3 [Rockson]RFC3323 Currently, dialog matching uses only the tags in the To and From headers, rather than the whole header fields. Thus, under the new rules the URI values in the To and From headers themselves could be altered by intermediaries. However, some legacy clients might consider it an error condition if the value of the URI in the From header altered between the request and the response. But to better cover RFC2543 UA it later says, Therefore, any time that a privacy service needs to modify any dialog-matching headers for privacy reasons, it SHOULD act as a transparent back-to-back user agent, and it MUST persist the former values of the dialog-matching headers. These values MUST be restored in any messages that are sent to the originating user agent. So, IMO, if the UAs you are facing is based on RFC3261, I think the from header change is OK. Regards, -Rockson On Fri, Jun 20, 2008 at 2:55 PM, James M. Polk wrote: > At 01:10 AM 6/20/2008, brijesh nair wrote: > > Hi, > > > > I have a question regarding provisional responses in SIP. Can the > > username/displayname part of To/From header be changed in a > > provisional response to a SIP request ? If so, can you please direct > > me to a draft/rfc which states this can be done ? > > RFC 4474 (SIP Identity) states the display name in the To header cannot be prevented from being changed (therefore shouldn't be trusted) in any response. Does that answer your question? > > > > > Thanks and Regards, > > Brijesh > > > > > > > > _______________________________________________ > > 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 > > _______________________________________________ > 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 _______________________________________________ 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
