Re: [sipcore] About Join and Replaces Headers: //Replaces header's extension

[[e-mail]]

Paul,

> IIUC, you are talking about (1):
> 
>    X -------------------- Y
>        voice/video
> 
> moving to (2):
> 
>    X -------------------- Y
>    |       voice
>    |
>    +--------------------- Z
>          HD video
> 
> Is that right?

Yes.


> And then you are looking for the signaling that will allow that to 
happen?
> 
> An INVITE with Join by Z to X would probably result in (3):
> 
>    X -------------------- Y
>    |       voice/video
>    |
>    +--------------------- Z
>          HD video
> 

The video between X and Y would be still exsit, and would not be replaced, 
after Z has the HD video.

The requirement is to transfer the video from Y to Z.

> while an INVITE with Replaces by Z to X would probably result in (4):
> 
>    X -------------------- Z
>           video
> 

By current Replaces header's semantics, the dialog between X and Y would 
be teared down.

So, my intention is to do extension for it.

> ISTM that (3) is pretty reasonable, after which X can drop its video 
stream.

If Y can only afford just one video stream at the same time(there's some 
hardware based devices are so), Y can not maintain the two video 
streams(one normal and another HD) at the same time.

Thanks,

Gao

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