This option controls the Missed Call notification that appears on your LCD screen when you miss a call.
To access this option:
For a SPA504G:
For a SPA525G2
Press the Setup button.
Scroll to User Preferences and press Select.
Select Call Preferences.
Scroll to Miss Call Shortcut.
Press the Right Arrow key to turn the feature on and press the Save softkey.
Cisco SPA504, Cisco SPA514G, Cisco SPA525G2