Yeah, I remember that statement. Unfortunately, it only states there that the 
Session-Expires header is only allowed in those methods. It does not state that 
a Session Refresh is limited to those methods. I agree that it should be 
obvious, but as you said, they should have used more normative statements.

Joel Gerber
Network Operations Specialist - Telephone
Telephone
Eastlink
joel.ger...@corp.eastlink.ca    T: 519.786.1241

-----Original Message-----
From: Brett Tate [mailto:br...@broadsoft.com] 
Sent: March-27-15 10:03 AM
To: Joel Gerber; sip-implementors
Subject: RE: [Sip-implementors] Sessions Expires with Info

> I do wish that RFC 6086 was a bit more specific. It only states INVITE
or
> UPDATE in-dialog transactions as refreshers, but, nowhere does it 
> state
that
> they are the only ones allowed for refreshing. A little bit of wording
change
> would have saved a lot of headaches.

I agree that RFC 4028 potentially could have used more normative text; however 
it does indicate the following.

Section 4:

"The Session-Expires header field conveys the session interval for a SIP 
session.  It is placed only in INVITE or UPDATE requests, as well as in any 2xx 
response to an INVITE or UPDATE."
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