Re: [Sip] Review of draft-kuthan-sip-derive-00

[Hadriel Kaplan <HKaplan at acmepacket.com>]

> -----Original Message-----
> From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of Adam
> Roach
>
> I think the greatest appeal of an approach like the one in DERIVE, if it
> can be made to work, is that it requires no explicit support on the
> calling party's side.

That's not totally accurate, methinks.  It requires support for the dialog-event package on the UAC, and requires the UAC to allow some random far-end UA outside its domain that it does not know about to subscribe to it.  [And it requires the path between the UAC and UAS to not contain b2bua's that change call-id or tag, of course]

The set of deployed devices/paths which satisfy those requirements is not the universe, but then again it's not the null set either. ;)

-hadriel
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