Re: [splices] SIP INVOKE method v1
"Shekh-Yusef, Rifaat (Rifaat)" <rifatyu@avaya.com> Tue, 14 June 2011 16:30 UTC
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From: "Shekh-Yusef, Rifaat (Rifaat)" <rifatyu@avaya.com>
To: Paul Kyzivat <pkyzivat@cisco.com>, "splices@ietf.org" <splices@ietf.org>
Date: Tue, 14 Jun 2011 12:30:15 -0400
Thread-Topic: [splices] SIP INVOKE method v1
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Subject: Re: [splices] SIP INVOKE method v1
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Hi Paul, Thanks for the detailed review and feedback. I agree with you that this is the next thing that we need to describe in details. I will be working on providing more details to explain our thinking around the various actions and parameters. Regards, Rifaat > -----Original Message----- > From: splices-bounces@ietf.org [mailto:splices-bounces@ietf.org] On Behalf Of > Paul Kyzivat > Sent: Friday, June 10, 2011 3:46 PM > To: splices@ietf.org > Subject: Re: [splices] SIP INVOKE method v1 > > This is getting better with age! > > Splitting off the subscription is good. > > An area that still needs work is in the semantics of the urns. > Some of them are more clear than others. Some are "limited" in ways that > might not matter to some but that could prove a problem in the end. > Specifically: > > o Answer call - urn:invoke:call:answer > o Terminate call - urn:invoke:call:terminate > o Decline call - urn:invoke:call:decline > o Ignore call - urn:invoke:call:ignore > > The above need some elaboration, but I think its just work - probably > anybody who does it will end up with an equivalent result. > > o Send call to VM - urn:invoke:call:sendvm > > VM is a "feature", and we haven't standardized features much, except for > bliss. How does one know if the recipient understands VM and what to do > to send a call there? What if there are multiple VM options (e.g. what > to say, etc.) And what if the call isn't a voice call. (Maybe VM now > means voice/video mail. But the "call" could be IM.) > > o Hold call - urn:invoke:call:hold > o Unhold call - urn:invoke:call:unhold > o Mute call - urn:invoke:call:mute > o Unmute call - urn:invoke:call:unmute > > Similarly these are all "features" that we all have some expectations > about, but that are not rigorously defined. (But perhaps Mute/Unmute > could be formalized by using the 'transducer' option. (Transducer=none?) > > My concern with all these "features" is that we are being put into a box > where we must either: > - define them with sufficient rigor > - fall back on "do what I mean", which has proved to be a bad idea, > because not everybody has the same notion of what they mean. > > o Conference - urn:invoke:conference:add > - urn:invoke:conference:remove > > This one may be clearer due to the existence of xcon specs. > > Regarding action parameters: > > o media=audio|video|audvid > > I'm troubled by audvid. I would rather see "audio,video". Specifically, > what is the namespace here, and what does specifying it mean? I think > the namespace could be: one or more values allowable as the <media> > parameter in the m-line in SDP. > > Defining exactly what it means when present is a little harder. When > answering a call that has an offer, I guess it could mean: refuse any > m-lines with media type that doesn't match one of these, and accept as > many of the remaining as you can. > > For answering an offerless invite, I guess it could mean: offer whatever > media you are capable of offering that match one of these, but don't > offer anything that doesn't match. > > Is there likely to be a need to get more specific? E.g. about what > codecs to use? (Hopefully not - that could get very messy.) > > o transducer=speaker|headset > > My deskphone has three possibilities: speaker|headset|handset. > And I'm far from certain this is exhaustive. (The clue wg is defining a > much more complex environment.) This at least needs to be extensible. We > may need some sort of extended model of a UA that includes this sort of > stuff. > > o target=<AOR> > o direction=recvonly|sendonly|sendrecv > o abort > > None of this is intended as objection to the work so far. Its just a > start at identifying what else there is to do. The whole notion of > naming features to invoke causes me the most concern. > > Thanks, > Paul > > On 6/10/2011 3:08 PM, Shekh-Yusef, Rifaat (Rifaat) wrote: > > Hi, > > > > We have just submitted a new version of the SIP INVOKE method draft that > > does not include implicit subscription. > > > > https://datatracker.ietf.org/doc/draft-yusef-splices-invoke/ > > > > We would appreciate it if you review the document and provide us with > > your feedback. > > > > Thanks, > > > > Rifaat > > > > > > > > _______________________________________________ > > splices mailing list > > splices@ietf.org > > https://www.ietf.org/mailman/listinfo/splices > _______________________________________________ > splices mailing list > splices@ietf.org > https://www.ietf.org/mailman/listinfo/splices
- Re: [splices] SIP INVOKE method v1 Paul Kyzivat
- [splices] SIP INVOKE method v1 Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] SIP INVOKE method v1 Hutton, Andrew
- Re: [splices] SIP INVOKE method v1 Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] SIP INVOKE method v1 Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] SIP INVOKE method v1 Hutton, Andrew
- Re: [splices] SIP INVOKE method v1 Worley, Dale R (Dale)
- Re: [splices] SIP INVOKE method v1 Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] SIP INVOKE method v1 Alan Johnston
- Re: [splices] SIP INVOKE method v1 Hutton, Andrew
- Re: [splices] SIP INVOKE method v1 Hutton, Andrew
- Re: [splices] SIP INVOKE method v1 Worley, Dale R (Dale)
- Re: [splices] SIP INVOKE method v1 Paul Kyzivat
- Re: [splices] SIP INVOKE method v1 Peter Musgrave
- Re: [splices] SIP INVOKE method v1 Hutton, Andrew
- Re: [splices] SIP INVOKE method v1 R.Jesske
- Re: [splices] SIP INVOKE method v1 Shekh-Yusef, Rifaat (Rifaat)