Aastra SIP 480I Administrator's Manual page 344

IP Phone Administrator Guide
Operational, Basic, and Advanced Parameters
Parameter –
sip session timer
Session Timer
(in Web UI)
Description
Format
Default Value
Range
Example
Parameter –
sip T1 timer
T1 Timer
(in Web UI)
Description
Format
Default Value
Range
Example
A-54
Aastra Web UI Advanced Settings->Global SIP->
Advanced SIP Settings
Configuration Files aastra.cfg, <mac>.cfg
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.
Integer
0
Not Applicable
sip session timer: 30
Aastra Web UI Advanced Settings->Global SIP->
Advanced SIP Settings
Configuration Files aastra.cfg, <mac>.cfg
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).
Integer
500
Not Applicable
sip T1 timer: 600
41-001129-00 Rev 09, Release 1.4.1