Skip to main content

SIP Session Timer

Document Type Expired Internet-Draft (mmusic WG)
Expired & archived
Author Steve Donovan
Last updated 1999-06-22
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document proposes an extension to the SIP specification. This extension adds a new message header that is used to specify the duration of a requested session. The session timer can be used to control the duration of a session if, for instance, one of the participants in the session wants to limit the cost of the session. It can also be used by stateful SIP Proxy Servers to track the status of sessions for which session state exists on the servers. Currently a stateful SIP Proxy Server that is not handling the media stream(s) for the session has no mechanism to definitively determine the state of all sessions for which it has state. While the SIP Specification does provide the BYE method for terminating the session, there is no mechanism for a SIP Proxy Server to detect the end of a session when the BYE message is not sent or is lost due to network problems.


Steve Donovan

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)