[Sip] REFER and Replaces with early dialogs

["JF Rey" <jfr@post.com>]

I'm quite sure that someone already asked about this, but I did not find it in the archives.

I try to understand whether a SIP phone can transfer another one when the target of
the transfer is ringing.

draft-biggs-sip-replaces-01.txt states that
<DRAFT_QUOTE>
The to-tag and from-tag parameters MUST be included in the Replaces header, 
</DRAFT_QUOTE>
and
<DRAFT_QUOTE>
If the Replaces header matches an unestablished call leg, that it,
   the INVITE request for the call has not received or been sent a final
   response, the Replaces header MUST be ignored.
</DRAFT_QUOTE>

I don't understand the last sentence. Why ignore Replaces even if a match was found
thanks to it ?

In bis07, the to-tag is mandatory for 1xx (other than 100) responses. So, Replaces 
could match an early dialog as soon as a 1xx  (other than 100) is sent/received.

Did I overlook something ?

Regards,

Jean-Francois Rey
-- 

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