Description
BusinessPhone – Dialog 4425 IP Vision18
Tones & Signals
Tones are audible in the handset.
Ringing signals are emitted from the phone.
Note: The tones and ringing signals in this guide refer to the
standard system but may vary between countries.
Dial tone
(System ready to accept digits)
Special dial tone
(System ready to accept digits,
active diversion on telephone)
Ringing tone
(Ringing signal to called party)
- repeated after 4 s
Busy tone
(Called party is busy)
Number unobtainable tone
(Called number not accessible or vacant)
Call Waiting tone
Congestion tone
(Call cannot be executed due to
congestion or called party blocked)
Verification tone
(Verification that ordered function is
accessed)
Intrusion tone
(Sent to all parties during Intrusion)
Internal ringing signal - repeated after 4 s
External ringing signal - repeated after 4 s
Automatic Callback signal
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