Aastra 6757i CT User Manual page 176

Cordless Handset
When in an idle state, pressing the Menu key  of the handset presents the following list of options. Once in the menu
list the user can scroll up Ïand down  using the scrolling keys to see each option.
Item # Menu list
1 Intercom
2 Language
3 Ring tone
4 Custom name
5 Timer Off
6 Vibrate Off
7 Handset pairing
8 Key lock Off
9 Backlight Off
10 Silent Alert Off
Note:
The display returns to idle if no action/activity is initiated within 20 seconds.
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