Re: [splices] Answering a Call Using Two Separate Devices proposal
Peter Musgrave <peter.musgrave@magorcorp.com> Mon, 02 May 2011 13:45 UTC
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From: Peter Musgrave <peter.musgrave@magorcorp.com>
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Date: Mon, 02 May 2011 09:45:44 -0400
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To: "Shekh-Yusef, Rifaat (Rifaat)" <rifatyu@avaya.com>
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Subject: Re: [splices] Answering a Call Using Two Separate Devices proposal
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Hi Rifaat, I think this works well. Thanks for re-stating this clearly. I see a couple of next steps here: - how is in incoming call which has an initial A+V answered? - how is an outgoing call which has an initial A+V audio created? - if both ends are "loosely coupled" are there any optimizations or shortcuts that seem worthwhile? I don't think there is anything too tricky about these - but they will need to be worked through. I agree with Simon that it seems time to start to capture this work in a draft. Regards, Peter Musgrave On 2011-05-01, at 11:41 AM, Shekh-Yusef, Rifaat (Rifaat) wrote: > Hi, > > In the following flow, I have tried to incorporate all the feedback that I received so far. > The only open issue that I am aware of is the issue of what to present to the user on the PC when the phone initiates a video call to the PC (see (#) below). > > Can you please review the flow below and let me know if we have any other open issues? > > Regards, > Rifaat > > > > Alice Alice Proxy Bob > PC Desk Phone > | | | | > | | | | > Both Alice's devices subscribe to the reg event package, which allows each device to > discover the capabilities of the other device based on the feature tags provided by each device. > The Desk Phone knows that the PC supports Video, while the PC knows that the Desk Phone only supports audio. > | | | | > | | SUBSCRIBE reg | | > | |-------------------->| | > | | 200 OK | | > | |<--------------------| | > | | | | > | SUBSCRIBE reg | | | > |------------------------------------------>| | > | 200 OK | | | > |<------------------------------------------| | > | | | | > | | | | > The two devices also subscribe to the dialog of each other. > | | | | > | | | | > | SUBSCRIBE dialog | | | > |-------------------->| | | > | 200 OK | | | > |<--------------------| | | > | | | | > | SUBSCRIBE dialog | | | > |<--------------------| | | > | 200 OK | | | > |-------------------->| | | > | | | | > | | | | > The scenario starts with an audio call from Bob to Alice > | | | | > | | | INVITE Alice [Audio]| > | | |<--------------------| > | | INVITE Alice [Audio]| | > | |<--------------------| | > | INVITE Alice [Audio]| | | > |<------------------------------------------| | > | | | | > Let's assume that Alice used her PC to instruct the phone to answer the call > | | | | > | REFER Refer-To: urn:sip-action:call:answer;transducer=speaker|headset > |-------------------->| | | > | 200 OK | | | > |<--------------------| | | > | | | | > | | 200 OK [Audio] | | > | |-------------------->| | > | | | 200 OK [Audio] | > | | |-------------------->| > | CANCEL | | | > |<------------------------------------------| | > | | | | > | |<---dialog1------------------------------->| > | | | | > | |<======audio==============================>| > | | | | > | | | | > > (*) > > | | | | > | | | | > | | | | > The following is a re-INVITE from the remote party (Bob) to add video to the existing audio call > | | | | > | | | reINVITE Alice [A/V]| > | | |<--------------------| > | | reINVITE Alice [A/V]| | > | |<--------------------| | > | | 100 Trying | | > | |-------------------->| | > | | | 100 Trying | > | | |-------------------->| > | | | | > The Desk Phone cannot handle video, but it knows that the PC can handle video, > so the Desk Phone initiates a new video INVITE to the PC. > Alert-Info is used to control the alerting level. > | | | | > | | | | > (#) | INVITE [Video] | | | > | Alert-Info: whatever | | > |<--------------------| | | > | 180 | | | > |-------------------->| | | > | | | | > The user can answer the video call using his PC, which would result on > 200 OK with video answer being sent to the phone. > If the user chose to answer the incoming video call using his Desk Phone, > the following REFER will be sent to the PC, before the 200 OK with the > video answer is sent from the PC. > | | | | > | REFER Refer-To: urn:sip-action:call:answer | > |<--------------------| | | > | 200 OK | | | > |-------------------->| | | > | | | | > | 200 OK [Video] | | | > |-------------------->| | | > | | | | > | | 200 OK [A/V] | | > | |-------------------->| | > | | | 200 OK [A/V] | > | | |-------------------->| > | | | | > |<----dialog2-------->|<---dialog1------------------------------->| > | | | | > | |<======audio==============================>| > |<============================video==============================>| > | | | | > | | | | > > > > Now let's assume that Alice is the side that wants to add video to the > existing audio call. The scenario continues after the (*) above. > > Alice can use her phone to add video to the existing audio call. The phone > must present a UI to Alice to allow her to do just that. If Alice chooses > to use her phone, the following REFER will be sent from the phone to the PC, > which will instruct the PC to immediately send an INVITE with video offer > > | REFER Refer-To: urn:sip-action:call:join;dialog=dialog1;media=video > |<--------------------| | | > | 200 OK | | | > |-------------------->| | | > | | | | > > Alice can use her PC to add video to the existing audio call. > The PC knows that there is an existing dialog between the Desk Phone > and Bob and present this to Alice for her to choose if she wants to > add video to the existing audio call or not. In this case Alice chose > to add video to the existing audio call, so the PC sends the following > request: > | | | | > | | | | > | INVITE with Join [Video] | | > |-------------------->| | | > | 100 | | | > |<--------------------| | | > | | re-INVITE [A/V] | | > | |-------------------->| | > | | | re-INVITE [A/V] | > | | |-------------------->| > | | | 200 OK [A/V] | > | | 200 OK [A/V] |<--------------------| > | |<--------------------| | > | 200 OK [Video] | | | > |<--------------------| | | > | | | | > | | | | > |<----dialog2-------->|<---dialog1------------------------------->| > | | | | > | |<======audio==============================>| > |<============================video==============================>| > | | | | > | | | | > | | | | > > > > _______________________________________________ > splices mailing list > splices@ietf.org > https://www.ietf.org/mailman/listinfo/splices
- [splices] Answering a Call Using Two Separate Dev… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Peter Musgrave
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Peter Musgrave
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Peter Musgrave
- Re: [splices] Answering a Call Using Two Separate… gao.yang2
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Elwell, John
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Elwell, John
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Simon Pietro Romano
- Re: [splices] Answering a Call Using Two Separate… Peter Musgrave
- Re: [splices] Answering a Call Using Two Separate… Salvatore Loreto
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Answering a Call Using Two Separate… Paul Kyzivat
- Re: [splices] Answering a Call Using Two Separate… Shekh-Yusef, Rifaat (Rifaat)