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[splices] Answering a Call Using Two Separate Devices proposal

"Shekh-Yusef, Rifaat (Rifaat)" <rifatyu@avaya.com> Fri, 22 April 2011 16:03 UTC

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From: "Shekh-Yusef, Rifaat (Rifaat)" <rifatyu@avaya.com>
To: "splices@ietf.org" <splices@ietf.org>
Date: Fri, 22 Apr 2011 12:02:56 -0400
Thread-Topic: Answering a Call Using Two Separate Devices proposal
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Subject: [splices] Answering a Call Using Two Separate Devices proposal
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Hi,

I would like to discuss the following proposal for addressing the scenario of answering a call using two separate devices:


   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 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 answer the call    
    |                     |                     |                     |
    | REFER Refer-To: urn:sip-action:call:answer                      |
    |-------------------->|                     |                     |
    | 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
    |                     |                     |                     |
    |                     |                     | INVITE Alice [A/V]  |
    |                     |                     |<--------------------|
    |                     | INVITE 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.
    |                     |                     |                     |
    | INVITE [Video]      |                     |                     |
    |<--------------------|                     |                     |
    | 180                 |                     |                     |
    |-------------------->|                     |                     |
    |                     |                     |                     |
The user can either answer the video call using his PC, or his Desk Phone.
If the user chose to answer the incoming video call using his Desk Phone,
the following REFER will be sent to 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 uses her PC and attempt to initiate a new video call. Because the 
PC is aware that another device is logged in using the same AOR, it will
try to find if there is any existing dialog on the other device by 
subscribing to the dialog event package
    |                     |                     |                     |
    | SUBSCRIBE dialog    |                     |                     |
    |-------------------->|                     |                     |
    | 200 OK              |                     |                     |
    |<--------------------|                     |                     |
    | NOTIFY              |                     |                     |
    |<--------------------|                     |                     |
    | OK                  |                     |                     |
    |-------------------->|                     |                     |
    |                     |                     |                     |
The PC discovers 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 
attach the new video call to the existing audio call or not. In this 
case Alice chose to attach the new video call to the existing audio call
    |                     |                     |                     |
    |                     |                     |                     |
    | INVITE [Video]      |                     |                     |
    |        Target-Dialog: dialog1             |                     |
    |-------------------->|                     |                     |
    | 100                 |                     |                     |
    |<--------------------|                     |                     |
    |                     | re-INVITE [A/V]     |                     |
    |                     |-------------------->|                     |
    |                     |                     | re-INVITE [A/V]     |
    |                     |                     |-------------------->|
    |                     |                     | 200 OK [A/V]        |
    |                     | 200 OK [A/V]        |<--------------------|
    |                     |<--------------------|                     |
    | 200 OK [Video]      |                     |                     |
    |<--------------------|                     |                     |
    |                     |                     |                     |
    |                     |                     |                     |
    |<----dialog2-------->|<---dialog1------------------------------->|
    |                     |                     |                     |
    |                     |<======audio==============================>|
    |<============================video==============================>|
    |                     |                     |                     |
    |                     |                     |                     |
    |                     |                     |                     |


Regards,
 Rifaat

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