Hi,
When I read section 3. Overview of Solution, it sounds like only the UA
which will not be confused on reception of an updated "From" header
has to indicate this to the other end:
----------------------------------------------------------------------
To cater for any UAs that are not able to tolerate a change of URI, a
new option tag "from-change" is introduced for providing a positive
indication of support in the Supported header field.
----------------------------------------------------------------------
On the other hand, when I read section 4.1 I hesitate about intention of
including "from-change" option tag in Supported header.
----------------------------------------------------------------------
4.1. Behaviour of a UA that Issues an INVITE Request Outside the
Context of an Existing Dialog
When issuing an INVITE request, a UA compliant with this
specification MUST include the "from-change" option tag in the
Supported header field.
----------------------------------------------------------------------
Does a UA, which updates "From" header (or conveys an updated "From" header)
have to include "from-change" option tag in Supported header?
Thanks,
-volka
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