Aastra Telecom 41-001343-02 manual Renewal would be sent at the half-way point as 100/2

Operational, Basic, and Advanced Parameters

Parameter –	Configuration Files
sip registration renewal timer	aastra.cfg, <model>.cfg, <mac>.cfg
Description	The threshold value, in seconds, prior to expiration, that the phone renews registrations.
	The phone will automatically send registration renewals half-way through the registra-
	tion period, unless half-way is more than the threshold value.
	For example, if the threshold value is set to 60 seconds and if the registration period is
	600 seconds, the renewal REGISTER message will be sent 60 seconds prior to the expira-
	tion, as half-way (600/2) > 60. If the registration period was 100 seconds, then the
	renewal would be sent at the half-way point as (100/2) < 60.
Format	Integer
Default Value	15
Range	0 - 2147483647
	The value set for this parameter should be between 0 and the value set for the registra-
	tion period.
Example	sip registration renewal timer: 10

Parameter –	Configuration Files
sip subscription timeout retry timer	aastra.cfg, <model>.cfg, <mac>.cfg
Description	Applicable for all event packages, this parameter controls how long the phone delays
	then retries a subscription when a SUBSCRIBE request is responded with a 408 (timeout)
	or 503 (service unavailable) error code.
	Note:
	If set to 0 or an invalid value is set, the parameter will not take effect.
Format	Seconds
Default Value	0
Range	1-3600
Example	sip subscription timeout retry timer: 60
Parameter –	Configuration Files
sip subscription failed retry timer	aastra.cfg, <model>.cfg, <mac>.cfg
Description	Applicable for all event packages, this parameter controls how long the phone delays
	then retries a subscription when a SUBSCRIBE request is responded with error codes
	other than 408 (timeout) or 503 (service unavailable).
	Note:
	If set to 0 or an invalid value is set, the parameter will not take effect.
Format	Seconds
Default Value	0
Range	1-3600
Example	sip subscription failed retry timer: 30

A-85 41-001343-02 REV04 – 05.2014