administration.fmA31003-S2030-M100-11-76A9, 01/2015OpenStage SIP V3R3 for OpenScape Voice, Administration Manual 113AdministrationSystem Settings3.5.9 SIP Session TimerSession timers provide a basic keep-alive mechanism between 2 user agents or phones. Thismechanism can be useful to the endpoints concerned or for stateful proxies to determine thata session is still alive. This is achieved by the phone sending periodic re-INVITEs to keep thesession alive. If no re-INVITE is received before the interval passes, the session is consideredterminated. Both phones are supposed to terminate the call, and stateful proxies can removeany state for the call.This feature is sufficiently backward compatible such that only one end of a call needs to im-plement the SIP extension for it to work.The parameter Session timer enabled determines whether the mechanism shall be used, andSession duration (seconds) sets the expiration time, and thus the interval between refreshre-INVITEs.Data required• Session timer enabled: Activates or deactivates the session timer mechanism.Value range: "Yes", "No"Default value: "No"• Session duration (seconds): Sets the expiration time for a SIP session.Default: 3600> Some server environments support their own mechanism for auditing the health ofa session. In these cases, the Session timer must be deactivated.For OpenScape Voice, the Session timer should be deactivated.
