AT&T TL7612 - Manual (Page 5)

Three quick beeps
VOLUME /
+ -
keys are pressed
when the volume is already at its
highest or lowest setting.
The headset is not registered and the
headset
ON/
OFF
button was pressed.
The headset is out of range from the
headset base during a call.
•
•
•
One short beep
every 0 seconds Low battery warning.
One short beep
every 5 seconds The call is muted.
One long beep
(repeated) Call waiting alert tone.
One short beep The headset ON/OFF key is pressed to
go on hook or off hook.
Quick reference guide - headset
Headset alert tones