Re: [Sip] [RFC 4235 & draft-kuthan-sip-derive] 481 "Call doesn't exist" for initial SUBSCRIBE ?

[Dale.Worley at comcast.net]

   From: =?utf-8?q?I=C3=B1aki_Baz_Castillo?= <ibc at aliax.net>

   I suppose 404 is also unappropiate, isn't?

It's not clear to me reading RFC 4235 that a SUBSCRIBE with an Event
header that specifies a Call-Id that is unknown to the UAS will result
in a failure response.  It may obtain a NOTIFY that lists no dialogs.

But if it does receive an error, 404 seems the most appropriate.

In any case, for the purposes of DERIVE, none of that matters:  Any
failure response to the SUBSCRIBE, or a NOTIFY that does not list the
call in question, results in call rejection.

Dale
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