Operational Features
41-001160-00, Release 2.1, Rev 04 5-121
Configuring Operational Features
Operational IP Phone Features
Aastra Web UI
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.