User's Manual

167
Appendix
Telephone base alert tones
One short beep Tone of each key press, if key tone is turned on.
One long beep Indication to begin recording a message, memo or announcement.
Indicates the start of message recording during call screening or
the end of a message playback session.
Two short beeps You are pressing /VOLUME/ on the telephone base when the
volume is already at its highest or lowest setting.
-OR-
Call waiting tone.
-OR-
Error tone.
-OR-
Registration slots are full.

(Three rising tones)
The system has completed the command successfully.
Four beeps The other party has ended your intercom call.
Four short beeps Registration failure tone.
Four rising tones 
Beeps every 10 seconds Message alert.
Alert tones