Aastra Telecom 57I Manual Do Utilizador

Operational Features

41-001160-00, Release 2.1, Rev 04

5-121

Configuring Operational Features

1

Click on Advanced Settings->Global SIP->Advanced SIP Settings.

2

Enter a value, in seconds, from 120 (2 min) to 3600 (1 hour) in the "BLF Subscription Period" field.

3

Click 

 to save your changes.