RE: [Sip] draft-ietf-sip-cc-transfer-05
Robert Sparks <rsparks@dynamicsoft.com> Fri, 05 October 2001 15:20 UTC
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From: Robert Sparks <rsparks@dynamicsoft.com>
To: 'Sarvi Shanmugham' <sarvi@cisco.com>, Robert Sparks <rsparks@dynamicsoft.com>
Cc: sip@ietf.org
Subject: RE: [Sip] draft-ietf-sip-cc-transfer-05
Date: Fri, 05 Oct 2001 10:57:51 -0400
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Look for threads back in the Dec 2000 / Feb 2001 timeframe (check the minutes of the Dec ietf and the Feb interim meeting). I've got the reasoning below - REFER is not INVITE. The non-INVITE transaction model times out quickly whether there are provisional responses or not. (There have been other threads on disallowing provisionals for non-INVITEs. They are allowed currently but they don't cause the transaction to wait any longer for a final response). I'm not sure I understand your third paragraph. Nothing in the current drafts prevents you from issuing NOTIFYs with progress information if you wish to expose it. (One could have a sipfrag with a status line of 183 for example). RjS > -----Original Message----- > From: Sarvi Shanmugham [mailto:sarvi@cisco.com] > Sent: Thursday, October 04, 2001 11:21 PM > To: Robert Sparks > Cc: sip@ietf.org > Subject: Re: [Sip] draft-ietf-sip-cc-transfer-05 > > > Hi Robert, > Could you please refer me to the thread that discusses this. > > What is the reasoning for not allowing provisional responses > to the REFER > method. > > Seems to me, that would be the cleaner way of doing this than > a one time > REGISTER with a NOTIFY option. > > As with this method, the Transferor cannot get intermediate > status of how > the transfer is going. The transferor application may want do > certain things > based on that status. > One example on a TELE-to-SIP gateway, would be a choice of > when the TELE > side should be disconnected or dropped. > The application might want to keep the telephony leg active till, > 1. the Transferee ACKs the REFER(which I believe > doesn't necessarily > mean the phone is ringing) > 2. the Transferee says the destination is ringing(may > be he wants to > reconnect if the destination comes back as a ring no-answer. > 3. the Transferee says the destination is connected. > > Thanks, > Sarvi > > Robert Sparks wrote: > > > If only we could... > > > > No. Non-INVITE transactions do not pend. They must > > complete immediately. If you've been following the > > open issues threads, you'll have seen the suggestion > > to kill off provisional responses (other than a 100 > > Trying to quench retransmissions) to non-INVITES. > > > > This feature of the non-INVITE transaction model is > > why we have the implicit subscribe and the separate > > NOTIFY instead of just waiting for the triggered > > action to complete before sending the final response > > to the REFER (on a historical note, that was the original > > proposal of over a year ago). > > > > RjS > > > > > -----Original Message----- > > > From: Sarvi Shanmugham [mailto:sarvi@cisco.com] > > > Sent: Tuesday, September 25, 2001 11:57 AM > > > To: sip@ietf.org > > > Subject: [Sip] draft-ietf-sip-cc-transfer-05 > > > > > > > > > > > > I have a question/concern in the blind transfer case. > > > > > > As per the current spec, > > > The TRANSFEREE responds with a Ack 202 to the REFER > method, before > > > the attempt to the Transfer target is initiated. > > > > > > The next possible message from the Transferee to the > Transferor is > > > NOTIFY(200 OK) and this is when the Transfer target > > > accepts(picks up the > > > phone). > > > > > > In a blind transfer, where I want to release the > > > Transferor, Ack202 > > > "may be" premature, and NOTIFY(200 OK) may be too late. > > > > > > Can the Transferee gateway, send an intermediate > NOTIFY(180 OK) > > > when the transfer target is "ringing". This could be a > more reliable > > > place to release the Transferee's line, than Ack 202 > > > > > > Any thoughts, > > > Sarvi > > > > > > > _______________________________________________ > > 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 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] draft-ietf-sip-cc-transfer-05 Sarvi Shanmugham
- RE: [Sip] draft-ietf-sip-cc-transfer-05 Robert Sparks
- Re: [Sip] draft-ietf-sip-cc-transfer-05 Sarvi Shanmugham
- RE: [Sip] draft-ietf-sip-cc-transfer-05 Robert Sparks
- RE: [Sip] draft-ietf-sip-cc-transfer-05 Tom-PT Taylor