Quoting from draft-ietf-sip-session-timer-10.txt (page 6): "The default value of the Session-Expires header field, when not present, is infinity. This means that absence of the Session-Expires header field implies no expiration."
Does this explanation refer to initial INVITE requests (or re-INVITEs that are following INVITEs with no Session-Expires header) only?
What should happen when a session refresh request (UPDATE or re-INVITE) is sent within a dialog with an active session timer, without Session-Expires header? Does this refresh request disable the session timer or just handled as usual refresh request without negotiation (about the timer interval until the next refresh)?
Best regards, John.
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