| Abstract
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This document defines an extension to the Session Initiation Protocol
(SIP). This extension allows for a periodic refresh of SIP sessions
through a re-INVITE or UPDATE request. The refresh allows both user
agents and proxies to determine if the SIP session is still active.
The extension defines two new header fields, Session-Expires, which
conveys the lifetime of the session, and Min-SE, which conveys the
minimum allowed value for the session timer.
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