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Audible Signals
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DT368
TONE CHARACTERISTICS
The following different tones and signals are sent from the
exchange to your handset or loudspeaker.
Dial tone
Special dial tone
Ringing tone or every 4th second
Queue tone
Busy tone
Congestion tone
Number unobtainable
tone
Call waiting tone
Intrusion tone
Conference tone every 15th second (to all parties)
Verification tone
Warning tone,
expensive route
RINGING SIGNALS Three different ringing signals inform you about the type of
the incoming call.
Internal ringing signal
External ringing signal
Recall signal
(automatic callback reminder)
(continued)