John Smith wrote:
Hi,
Assuming that I have the following scenario:
UAC A connects a call with UAS B using MinSE:100 and SessionExpires:180. Now UAC wishes to send an UPDATE towards B, what are the values of MinSE and SessionExpires headers, that A should use?
Section 7.1 in draft-ietf-sip-session-timer-14.txt says:
"If a Min-SE header is included in the initial session refresh request, the value of the Session-Expires MUST be equal to the value in Min-SE."
Section 7.1 doesn't apply here - section 7.4 does:
In a session refresh request sent within a dialog with an active session timer, the Sesssion-Expires header field SHOULD be present. When present, it MUST be equal to the maximum of the Min-SE header field (recall that its default value when not present is 90 seconds) and the current session interval.
Also in that section:
The UAC may have its own opinions about the minimum session interval. In that case, if the value above is too small, the UAC MAY increase it.
According to this rule, these headers MUST have the same value. Should the common value be 180 or 100?
Given both of the above rules, the common value could be anything between 100 and 180. If you take the opinion that the best value is the largest that is satisfactory to everybody, then 180 is the best choice.
But I think the SHOULD about including the Session-Expires is unnecessarily constraining. The same good results could be achieved by leaving it out.
Paul
Thanks in advance, John.
_________________________________________________________________
Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail
_______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
_______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
