2008/10/2, Dmitry Akindinov <[EMAIL PROTECTED]>:
> > For me this means that, in RFC 3261, Contact must be present in a 2xx
> > to an INVITE.
> >
>
> Yes, but according to this table it's optional for 1xx. And 3262 does not
> update that, though with reliable 1xx the Contact is more likely to be
> needed to address the PRACK.
Yes, but RFc3261 updates the 1xx behaviour when it clearly says:
RFC 3262:
------------------------------------------------------
4 UAC Behavior
The provisional response ***MUST establish a dialog*** if one is not yet
created.
-------------------------------------------------------
And note that for a dialog to be established it's needed a remote
target (not the initial RURI).
So, it's true that RFC 3262 doesn't update the table, but note that
"Contact" just would be required if the 1xx includes a "Require:
100rel", so there is no need to update that table. In any case RFC
3262 could add:
Header field where proxy ACK BYE CAN INV OPT REG
___________________________________________________________
Contact R o - - m o o
Contact 1xx - - - o - -
Contact 1xx + 100rel - - - m - -
Contact 2xx - - - m o o
Contact 3xx d - o - o o o
Contact 485 - o - o o o
Well, as you say life would be better if RFC 3262 says that, but
however this is implicit by the above phrase "The provisional response
***MUST establish a dialog*** if one is not yet created".
--
Iñaki Baz Castillo
<[EMAIL PROTECTED]>
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