RE: [Sip] Questions about the SIP Replaces Header draft.
"Sriram Parameswar" <sriramp@nortelnetworks.com> Thu, 06 September 2001 20:14 UTC
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From: Sriram Parameswar <sriramp@nortelnetworks.com>
To: "'Padhye, Chinmay'" <c_padhye@trillium.com>, "'sip@ietf.org'" <sip@ietf.org>
Subject: RE: [Sip] Questions about the SIP Replaces Header draft.
Date: Thu, 06 Sep 2001 14:49:41 -0500
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Partial answer in-line prefaced by [Sriram]. Hope it helps. Sriram __________________________________________ Sriram Parameswar Phone: 972-685-8540 Interactive Multimedia Server (IMS) Fax: 972-685-3563 Nortel Networks, Richardson USA Email: sriramp@nortelnetworks.com -----Original Message----- From: Padhye, Chinmay [mailto:c_padhye@trillium.com] Sent: Wednesday, September 05, 2001 3:25 PM To: 'sip@ietf.org' Subject: [Sip] Questions about the SIP Replaces Header draft. Hello, I have a few questions and comments regarding the SIP Replaces Header draft - http://www.softarmor.com/sipwg/drafts/draft-biggs-sip-replaces-01.txt. 1) In section 3 the draft states - "The to-tag and from-tag parameters MUST be included in the Replaces header, as they are required for unique call-leg matching." In section 4 the draft states - "If the Replaces header matches more than one call-leg, the user agent MAY use the Referred-By header if present to attempt to match the call with an appropriate call-leg, but should otherwise ignore the header." The REFER draft says that the Referred-By header is mandatory (section 3.2 of REFER 01 draft). Hence the words "if present" in the above statement must be removed. [Sriram] The Refer draft says its mandatory in a REFER. The Replaces draft is talking about INVITEs. The Replaces header is sent only in an INVITE. The Refer draft goes on the say that the Referred-by may be carried in other SIP Requests like INVITEs so no changes are required. I also have a question regarding this - a) When will a Replaces header match more than one call-leg. The statements in the section 3 and 4 seem to contradict each other. 2) In section 4 of the draft it says - "If the Replaces header matches an unestablished call leg, that it, the INVITE request for the call has not received or been sent a final response, the Replaces header MUST be ignored." The "it" is a typo and should be "is". My question is - How will a Replaces header match an unestablished call leg when a response has not been received for an INVITE? 3) I think the figures shown with the examples do not conform to the latest REFER draft. None of the figures show NOTIFY being used. [Sriram] Correct! A new version needs to be done. Also need the 202 for the Refer. 4) The reference to the cc draft - reference [4], is to the old draft. Regards, Chinmay _______________________________________________ Sip mailing list http://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use sip-implementors@cs.columbia.edu for questions on current sip Use sipping@ietf.org for new developments on the application of sip
- [Sip] Questions about the SIP Replaces Header dra… Padhye, Chinmay
- RE: [Sip] Questions about the SIP Replaces Header… Sriram Parameswar
- Re: [Sip] Questions about the SIP Replaces Header… Henry Chen
- Re: [Sip] Questions about the SIP Replaces Header… Henry Chen