Aastra Telecom 41-001343-02 Connected sessions. See RFC4028 for details, Minimum session timer is

Operational, Basic, and Advanced Parameters

Parameter –	Configuration Files
sip session timer	aastra.cfg, <model>.cfg, <mac>.cfg
Description	The time, in seconds, that the IP phone uses to send periodic re-INVITErequests to
	keep a session alive. The proxy uses these re-INVITErequests 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 –	Configuration Files
sip T1 timer	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 –	Configuration Files
sip T2 timer	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 –	Configuration Files
sip transaction timer	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

A-83 41-001343-02 REV04 – 05.2014