[Sip] Re: draft-ietf-sip-replaces-04.txt

Paul,

Thanks for bringing this up.  I think the draft needs to distinguish 
between these cases:

1) The UA receives an offer with no compatible media and does not wish 
to maintain a session with no associated media.

2) The UA receives an offer but does not wish to send/receive media at 
the moment (possibly because it is negotiating a session using 3pcc on 
behalf of another UA).

I think the same distinction applies to UAs that receive "ordinary" 
INVITEs.  They can accept an offer but reject all the m-lines, or they 
can send a 4xx response. So...

- Do you think 3261 needs any clarification to make this distinction 
obvious?
- Can you propose some text for Replaces that makes clear my original 
intention (what you do in case 1), while still allowing for case 2?

thanks,
-rohan

On Monday, August 18, 2003, at 09:52 AM, Paul Kyzivat wrote:

>   "If the UA cannot accept the new INVITE (for example: it cannot
>    establish required QoS or keying, or it has incompatible media), the
>    UA MUST return an appropriate error response and MUST leave the
>    matched dialog unchanged."
>
> Exactly what is the meaning of "incompatible media" in the above?
>
> In general, when an INVITE arrives containing an offer, the recipient 
> may accept the INVITE while rejecting some or all of the media, up to 
> and including ending up with a call containing no media. If it is ok 
> to accept a call while rejecting all the media then there is no such 
> thing as a call with incompatible media.
>
> I fear that we will begin to have interop problems if some UAs accept 
> calls under this kind of situation, while others reject them.
>
> 	Paul
>

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