Aastra Telecom SIP 57I - Manual (Page 330)

Operational Features
5-120 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Operational IP Phone Features
BLF Subscription Period
On the IP phones, you can set the time period, in seconds, that the IP phone
resubscribes the BLF subscription service after a software/firmware upgrade or
after a reboot of the IP phone.
In the configuration files, you enter the following parameter with a valid value to
set the BLF subscription period:
sip blf subscription period: <value in seconds>
The minimum value for this 120 seconds (2 minutes). The default is 3600 (1
hour).
Setting this parameter to a value lower than 3600 allows the configured BLF
feature to become active more quickly after a software/firmware upgrade or after
a reboot of the IP phone. If you enter a value lower than 120 for this parameter,
the default value (3600) will be used by the IP phone.
You can configure this feature using the configuration files or the Aastra Web UI.
Configuring BLF Subscription Period
Use the following procedures to configure the BLF subscription period on the IP
phone.
Configuration Files
To configure the BLF subscription period on the IP phones using the configuration files, see Appendix A, the
section, “Advanced SIP Settings” on page A-62.