Aastra Telecom DECT 142 - Manual (Page 55)

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You can specify whether an incoming call is to be indicated by the
ringer (”buzzer”), the vibrator, or the headset.
Select an entry and activate
or deactivate the device by
pressing .
…
…
…
Press to accept the setting.
Use the arrow keys or the number keys "1" to "8" to set the desired
ring volume, then press
. OK
Volume Settings
Esc
Headset ✓
Vibrator ✓
Buzzer ✓
OK
– ✓
Device
Customizing Your Telephone