Re: [Sipping] Question on RFC 3725 (3PCC)

["Dale Worley" <dworley at pingtel.com>]

From: Elwell, John [john.elwell at siemens.com]

> I have a concern about the working of 3PCC when an SDP offer is rejected.
>
> In flow 1, what if the SDP offer from A is rejected by B? B will send a
488
> response to the controller, but this cannot be relayed back to A.
Presumably the
> only action that the controller can do is to send an ACK to A (but that
should
> contain an SDP answer, so how is it populated?) and then a BYE to A. A
will
> never receive the reason for failure. In particular, if the reasons for
failure
> was the rejection of key management for payload encryption, A cannot retry
> (e.g., without payload encryption). Of course, the controller can retry,
but it
> will probably yield the same result.

The difficulty of doing SDP negotiation well is one reason to avoid this
sort of "back-to-back user agent" schemes.

Dale


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