Re: [splices] Answering an A/V Call Using Two Separate Devices proposal

Paul Kyzivat <pkyzivat@cisco.com> Sun, 22 May 2011 03:15 UTC

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Date: Sat, 21 May 2011 23:15:11 -0400
From: Paul Kyzivat <pkyzivat@cisco.com>
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Subject: Re: [splices] Answering an A/V Call Using Two Separate Devices proposal
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I guess all of that can work. But for the last part, if the phone knows 
enough to send the invoke to the pc, why can't it just send an INVITE to 
the pc?

	Thanks,
	Paul

On 5/21/2011 8:56 AM, Shekh-Yusef, Rifaat (Rifaat) wrote:
> Hi,
>
> We are still working on a new version of the INVOKE document that removes the implicit subscription.
>
> Meanwhile I would like to continue the discussion of the various possible uses cases.
> The following is a proposal for Answering an A/V Call Using Two Separate Devices.
>
> 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 A/V call from Bob to Alice
>      |                     |                     |                     |
>      |                     |                     | INVITE Alice [A/V]  |
>      |                     |                     |<--------------------|
>      |                     | INVITE Alice [A/V]  |                     |
>      |                     |<--------------------|                     |
>      | INVITE Alice [A/V]  |                     |                     |
>      |<------------------------------------------|                     |
>      |                     |                     |                     |
>
>
> (*)
>
>
> Let's assume that Alice used her PC to answer the incoming call
> The PC instructs the phone to answer the audio call
>      |                     |                     |                     |
>      | INVOKE Action: urn:invoke:call:answer;media=audio;transducer=speaker|headset
>      |-------------------->|                     |                     |
>      | 200 OK              |                     |                     |
>      |<--------------------|                     |                     |
>      |                     |                     |                     |
>      |                     | 200 OK [Audio]      |                     |
>      |                     |-------------------->|                     |
>      |                     |                     | 200 OK [Audio]      |
>      |                     |                     |-------------------->|
>      | CANCEL              |                     |                     |
>      |<------------------------------------------|                     |
>      |                     |                     |                     |
>      |                     |<---dialog1------------------------------->|
>      |                     |                     |                     |
>      |                     |<======audio==============================>|
>      |                     |                     |                     |
>      |                     |                     |                     |
> The PC then adds Video to the existing audio call.
>      |                     |                     |                     |
>      | 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==============================>|
>      |                     |                     |                     |
>      |                     |                     |                     |
>
>
>
> The scenario continues after the (*) above
> Let's assume that Alice used her phone to answer the incoming call.
> The phone answers the audio call
>      |                     |                     |                     |
>      |                     | 200 OK [Audio]      |                     |
>      |                     |-------------------->|                     |
>      |                     |                     | 200 OK [Audio]      |
>      |                     |                     |-------------------->|
>      | CANCEL              |                     |                     |
>      |<------------------------------------------|                     |
>      |                     |                     |                     |
>      |                     |<---dialog1------------------------------->|
>      |                     |                     |                     |
>      |                     |<======audio==============================>|
>      |                     |                     |                     |
>      |                     |                     |                     |
> The phone then instructs the PC to initiate a video call to join the existing call
>      |                     |                     |                     |
>      | INVOKE Action: urn:invoke:call:join;media=video;dialog=dialog1
>      |<--------------------|                     |                     |
>      | 200 OK              |                     |                     |
>      |-------------------->|                     |                     |
>      |                     |                     |                     |
> The PC then adds Video to the existing audio call.
>      |                     |                     |                     |
>      | 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==============================>|
>      |                     |                     |                     |
>
>
>
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