Session Timers


SIP Session Timers are an extension of SIP RFC 2543 which allows a periodic refreshing of SIP sessions using the RE-INVITE message. The refreshing allows both user agents and proxies to determine if the SIP session is still active.

In addition, the SIP software supports response code 422.
in the SIP Support and Compliance Appendix.

Pertinent Specification

RFC 2543/4028


Use the following TLVs in the VoIP Protocol Configure (0x00EE) message to implement this feature:

0x027C Min-SE Interval

0x027B Session Interval