Re: [Sipping] Multi-media messaging and SIP

[Richard Barnes <[e-mail]>]

> However, when a GPRS user sends an MMS to multiple destinations, the 
> interworking function must take care of initiating the SIP and MSRP 
> sessions, send the message over all sessions and then releasing those 
> sessions. The same goes for IMPS.

Beacuse MSRP is inherently session-oriented, I don't think you're going 
to get around having to initiate and release SIP/MSRP sessions.

To simplify the internetworking function, perhaps what needs to be done 
is to define a way for MSRP relays to act as URI-list services.  That 
way, the internetworking function could:
1. Send a forked INVITE to all recipients
2. Gather responses and construct URI-list
3. Send message and URI-list to URI-list Service
The URI-list Service could then forward the message to all the 
recipients and relay MSRP REPORTs back to the internetworking function, 
who could then send BYE requests to close the SIP sessions.  Given the 
constraints that MSRP is session-oriented (hence requires 
initiation/release), I think that's about as simple as it can get.

(Actually, adding such a URI-list capability to MSRP relays seems like a 
good idea in general, since it would simplify the implementation of 
multi-party chat.)

Hope this helps,
--Richard





> 
> I think it would be advantageous to retro-fit session-based messaging 
> with the same capability as short messaging. One possible alternative 
> would be to allow the same MIME body defined in 
> draft-ietf-sipping-uri-list-message-07 in INVITE requests for MSRP 
> sessions. However this may not seem appropriate since it impacts a 
> rather basic message of the SIP specification. Any other alternative 
> would require defining a new mechanism specific for long, multi-media 
> messages, like e.g. content indirection.
> 
> I wonder if there've been some discussions on this issue already? What's 
> the oppinion of the sipping community on it?
> 
> Best regards,
> /Javier Arauz
> 
> 
> 
> 
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