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

[[e-mail]]

> You are focusing on the fact that you want to replace the user's 
> connection to a particular media stream.  But the Replaces header 
> specifies whether or not a *dialog* is replaced by another *dialog*,
> not whether a particular media rendering is replaced by another. 
> The only way that you can associate two dialogs while keeping them 
> both in existence is with Join.

Yes. This is the current defintion for Replaces header and Join header.

> 
> I think your usage would be helped by adding extension attributes to
> SDP so that which media stream was to replace/be mixed with which 
> other media streams (in a Join) could be specified.
> 

I once evaluated SDP extension. But the controlling semantics for the use 
case is about session control, while not session/streams attributes. So, I 
think the extension should be signalling control oriented, while not 
SDP(description) oriented.

So, I think the potential extension should be located in SIP headers, 
while not SDP.

Gao


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