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Operational, Basic, and Advanced Parameters
A-64 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Appendix A
Parameter –
sip session timer
Session Timer
(in Web UI)
Aastra Web UI Advanced Settings->Global SIP->
Advanced SIP Settings
Configuration Files aastra.cfg, <mac>.cfg
Description The time, in seconds, that the IP phone uses to send periodic
re-INVITE requests to keep a session alive. The proxy uses these
re-INVITE requests to maintain the status' of the connected sessions.
See RFC4028 for details.
Format Integer
Default Value 0
Range Not Applicable
Example sip session timer: 30
Parameter –
sip T1 timer
T1 Timer
(in Web UI)
Aastra Web UI Advanced Settings->Global SIP->
Advanced SIP Settings
Configuration Files aastra.cfg, <mac>.cfg
Description This timer is a SIP transaction layer timer defined in RFC 3261.
Timer 1 is an estimate, in milliseconds, of the round-trip time (RTT).
Format Integer
Default Value 500
Range Not Applicable
Example sip T1 timer: 600