On 3/10/16 6:52 AM, Brett Tate wrote:
I think a UAS is forbidden to include a Session-Expires header field in
the
UPDATE request and a UAC should reject it.
In that case, the value of session refresher in 200 OK of INVITE MUST be
uac.
I'm not sure why you think that it is forbidden.
RFC 4024 table 1 shows that Session-Expires is optional for UPDATE. Section
13 also shows Session-Expires within an UPDATE.
RFC 4024 section 7.2 indicates the following:
"Similarly, a re-INVITE or UPDATE request sent within a dialog for
purposes other than session refreshes will also have the effect of
refreshing the session, and its processing will follow the procedures
defined in this specification."
A consequence of this is that if you do a re-INVITE or UPDATE, and fail
to include Session-Expires, then you are *cancelling* the session timer.
Thanks,
Paul
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