Aastra SIP 53I Administrator's Manual page 328

IP Phone Administrator Guide
Operational Features
Aastra Web UI
1 Click on Operation->Softkeys and XML
or
Click on Operation->Programmable Keys
or
Click on Operation->Expansion Module <N>.
Depending on your phone-model, the key configuration screen displays. The 57i Key Screen is
shown as an example.
2 Select a softkey, programmable, or expansion module key to configure.
3 In the "Type" field, select "BLF" (Asterisk), "BLF\List" (BroadSoft BroadWorks).
5-118 41-001160-00, Release 2.1, Rev 04