AT&T TL96151 - Alert Tones and Lights; Handset Alert Tones; Telephone Base Alert Tones; Handset Indicator Lights

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Appendix
Alert tones and lights
Handset alert tones
Two short beeps
You are pressing CID or DIR when the volume is already at
its highest or lowest setting.
-OR-
You have reached the end of the caller ID history.
-OR-
Registration slots are full.
Three short high-pitched beeps The telephone has completed the command successfully.
Four short beeps Low battery warning.
-OR-
Out of range while the handset is on a call.
Four beeps (twice) Intercom call ended.
Telephone base alert tones
Handset indicator lights
CHARGE light
On when the handset is charging in the telephone base
or charger.
Backlight (lighted display and dial pad)
On when the handset is lifted from the telephone base
or charger.
On when a key is pressed.
/SPEAKER light
On when the speakerphone is in use.
Two short beeps
You are pressing CID or DIR when the volume is already at
its highest or lowest setting.
-OR-
You have reached the end of the caller ID history.
Three short high-pitched beeps The telephone has completed the command successfully.
Beeps once every 10 seconds Message alert.
Four short beeps Registration failure.