AT&T EL51103 - Telephone Base Indicator Lights; Handset Alert Tones

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Appendix
Screen icons, indicator lights and alert tones
Telephone base indicator lights
Handset alert tones
1 short beep A Key is pressed.
2 short beeps
Error tone. The command has failed.
You have reached the beginning or end of the list.
You have reached the minimum or maximum listening
volume.
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3 short beeps
The handset is out of range or there is no power at the
telephone base.
3 short high-pitched beeps
Confirmation tone. The telephone has completed the
command successfully.
4 short beeps Low battery warning.
IN USE light
On when the handset is in use.
On when a handset is being registered.
Flashes slowly when another telephone on the same line is
in use, or when all handsets are being deregistered.
Flashes quickly when there is an incoming call.
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