Elwell, John wrote:
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of [EMAIL PROTECTED]
However... If we change the sequence of operations a bit, so that the
UAS sends a 183 with a Contact carrying a specific header parameter
carrying a crypto-random value, and we get B2BUAs to pass it through
(attaching it to the Contact they use in the 183 they emit on the
other side), then if the UAS does a non-filtered dialog event
SUBSCRIBE, it can check the returned NOTIFY to see if it carries the
Contact header parameter that it created. That's a reasonably good
test that the UAC of the INVITE can be reached via the From value that
the UAS received.
[JRE] Unless a B2BUA fails to play according to the rules and
acknowledges the SUBSCRIBE without carrying out the same test on the
next hop.
That's kind of the point of Juri's draft, though -- semantically, the
recipient of the SUBSCRIBE doesn't need to know that this is an identity
check. So the B2BUA would have no obligation to do anything towards the
calling party.
/a
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