Re: [Sip] submission of a new I-D: "Dialog Event foR Identity VErification"

[jh at tutpro.com (Juha Heinanen)]

Iñaki Baz Castillo writes:

 > 1) The SUBSCRIBE arrives to the UA location.
 > - A calls B.
 > - B sends a SUBSCRIBE (Event: dialog;acll-id=xx;to-tag=xx) to A AoR.
 > - The proxy responsible for A receives the SUBSCRIBE and forwards it
 > to A location(s). Note that the proxy allows this SUBSCRIBE since the
 > "Event" header is "dialog" containing "call-id" and "to-tag". It could
 > also check if the "Expires" equals 0. So this is not a SUBSCRIBE "for
 > all the calls from/to A", but a SUBSCRIBE for an spedific dialog.

ok, that kind of tests are feasible for the proxy to do.

 > 2) The SUBSCRIBE is handled by a proxy / presence server.
 > - A calls B through P1 (proxy responsible for A).
 > - P1 includes a dialog presence agent (as pua_dialoginfo). This agent
 > generates a PUBLISH that is sent to the integrated (or separate)
 > dialog presence server (we are not speaking about a SIMPLE presence
 > server). So the dialog presence server is now aware of the current
 > dialog between A and B.

this kind thing would be very hard to implement reliably.

in summary, i'm in favor of this draft and suggest that it will
be published as a working group document.

-- juha
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