Re: [sip] extensions of "handling" parameter of Content-Disposition header

On Sep 22, 2008, at 4:11 AM, Sedlacek Ivo wrote:

> Hello Eric,
>
> thanks for your mail.
>
> > What precisely is the use case behind your request?
>
> The use case is to initiate sharing of a resource (stored at an  
> external server) to participants of a tightly coupled conference  
> (RFC4353).

I've been pondering this. Let me see if I can restate your use case.

A number of users are participating in a bridged conference. There is  
a persistent SIP-initiated session between each UA and the conference  
bridge.

One user wishes to command the conference bridge to retrieve a media  
sample and play it into the conference.

This "paying" operation does not change the session description for  
any of the existing sessions; rather it results in the delivery of  
specific media on the existing sessions to the end users.

One might envision any sort of control interface to the bridge. It  
might, for example, have a web-service interface. It might have an  
RTSP interface. One of the tricky bits of such an interface is  
correlating the SIP session that is to "hear" the media with the  
command protocol. For example, how in RTSP does one say "Play this  
media file onto the conference with  Alice, Bob, and Charlie, but not  
any other conferences".

But if the command interface is coaxial with a SIP dialog that  
supports a session, then we don;t have this correlation problem.

Something like an INFO package that has the semantic "Play the media  
reference by this INFO onto the session containing the INFO" might be  
appropriate. This is something like "render-to-this-session", as  
opposed to "render-to-the-user".

--
Dean
_______________________________________________
Sip mailing list  https://www.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use [email protected] for questions on current sip
Use [email protected] for new developments on the application of sip