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Operational, Basic, and Advanced Parameters
A-83 41-001343-02 REV04 – 05.2014
Parameter –
sip session timer
Configuration Files
aastra.cfg, <model>.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.
The minimum session timer is 90.
Format Integer
Default Value 0
Range 0, 90 +
Example sip session timer: 90
Parameter –
sip T1 timer
Configuration Files
aastra.cfg, <model>.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
Parameter –
sip T2 timer
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description This timer is a SIP transaction layer timer defined in RFC 3261.
Timer 2 represents the amount of time, in milliseconds, a non-INVITE server transaction
takes to respond to a request.
Format Integer
Default Value 0
Range Not Applicable
Example sip T2 timer: 8
Parameter –
sip transaction timer
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description The amount of time, in milliseconds that the phone allows the callserver (regis-
trar/proxy) to respond to SIP messages that it sends. If the phone does not receive a
response in the amount of time designated for this parameter, the phone assumes the
message has timed out.
Format Integer
Default Value 4000
Range 4000 to 64000
Example sip transaction timer: 6000