Operation Manual

Table Of Contents
85BusinessPhone Cordless DT400/DT410/DT420/DT430
Tones and Signals
Tones and Signals
Ton es
Tones are audible in the handset.
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
Special ringing tone
(Ringing signal to line 2)
- repeated after 4 s
Busy tone
(Called party is busy)
Number unobtainable tone
(Called number not accessible or vacant)
Blocking 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)
Conference tone
(Sent to all participants in a conference)
- repeated after 15 s