Re: 3pcc - controller receiving invite

>
> Hello All,
>
> My question is probably quite simple as I am new to SIP but I have a
> questions in relation to 3PCC best practices with SIP :
> http://tools.ietf.org/html/rfc3725.
>
> In all of the examples in this document, the controller initiates the
> session. My query relates to the scenario whereby if a device acting as a
> controller *receives *an invite. If this called controlling device was
> aware of a number of local devices it wanted to use in the session I imagine
> that it could either parse the initial invite SDP, and send the updated or
> new SDP (with relevant SDP parts) to each of the respective devices e.g. m
> =audio is sent to speaker, whereas m=video is sent to display device. Or an
> alternative approach would be just to forward the initial invite SDP to all
> the devices and parse and edit the SDP "answer" back to the calling device.
> Are both of these approaches valid? Please see the flow below :
>
>
> Audio / Video Device           Controller         Speaker       Display
> Device
>
           |                          |
|                   |
           |(1) INV SDP (m=video,     |                   |
|
           |      m=audio )           |
|                   |
                     |   ------------>          |                   |
                   |
           |                          |2)INV SDP m=audio
|                   |
                     |                          |  ------------>    |
                   |
           |                          |3)INV SDP m=video
|                   |
                     |                          |  ------------
-----------------------> |
           |                          |
|                   |
                     |                          | (4) 200 OK answer1|
                   |
           |                          |  (audio)          |
|
           |                          |<------------------|
|
                     |                          |                   |(5)200
OK answer2  |
           |                          |                   | (video)
|
           |                          |
<--------------------------------------|
           |                          |
|                   |
           |                          |
|                   |
                      |              (6)Parsing and combining of
|                   |
                         audio/video SDP at controller   |
|
           | 200 OK(Combined a/v SDP) |
|                   |
           |   <------------------    |
|                   |
           |      (7) ACK             |
|                   |
           |      -------------->     |
|                   |
           |                          |         (8) ACK
|                   |
           |                          |  -------------->
|                   |
           |                          |
|                   |
           |                          |       (9) ACK   ------------------->
|

====================================================================
          ==================================Media
Flow========================

====================================================================

Are there any known issues with this?
Thanks in advance,
Niall

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