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

[[e-mail]]

Paul and Dale,

In fact, some of our new designed call flows for the IUT(inter-UEs 
transfering) use the Join header frequently. But I think the semantics of 
the Join header in a lot of use case is not clear now, as showed in the 
previous mails.

Then, what about my comments on the "RFC3911's potential clarification"? 
And I think this work is relative urgent for me.

Thanks,

Gao

> Gao,
> 
> Sometimes there is value in strategic vagueness/ambiguity.
> To date that has been the case with sip around what media are used and 
> what it means when they are used. And its especially the case with 
> Replaces and Join.
> 
> There is nothing in SIP that says where or how media are rendered. If a 
> device has more than one potential device sip says nothing about which 
> one. (E.g. using the handset or speaker on a speaker phone.)
> 
> In the case of join, as Dale has said, it is really only about joining 
> the *dialogs*. There is a presumption that this will result in something 

> reasonable happening with the media streams, but its not specified. (An 
> exception to this is, I think, conferencing, which does talk about this 
> to some extent.)
> 
> Going beyond just letting the UAs do what they think is right is a *big* 

> step. (The conferencing stuff was a lot of work, and I don't know too 
> much about it.)
> 
> You might consider whether you could use conferencing controls to get 
> the kind of result you want. Otherwise, I think you have a big task and 
> had better investigate if anybody else wants to work on it.
> 
>    Thanks,
>    Paul
> 

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