Signaling, Tones, and Transmission
Italy
Tone Plan
Tone
Frequency
(Hz)
Cadence (s)
ARS 2nd Dial 425 0.2 on, 0.2 off, 0.6 on, 1 off, repeat forever
Busy 425 0.2 on, 0.2 off, repeat forever
Camp-on 425 0.2 on, 0.1 off, 0.2 on, 0.1 off
Conference 425 0.2 on, off
Confirmation 425 0.1 on, 0.1 off, 0.1 on, 0.07 off, repeat
Dial 350/425 Continuous
Feature Active Dial 350/425 0.7 on, 0.7 off, repeat forever
Interrupted Dial 425 0.9 on, 0.1 off, then (0.1 on, 0.1 off, 0.1 on, 0.7 off, repeat forever)
Message Notification 425 0.7 on, 0.7 off
Modem Answer 2025 0.95 on, 0.05 off, repeat
Override 425 0.2 on, off
Paging 425 0.2 on, off
Reorder 425 0.2 on, 0.2 off, repeat forever
Ringback 425 1 on, 4 off, repeat
Special Busy 425 0.2 on, 0.2 off, repeat forever
Special Ringback 425 1 on, 4 off, repeat
Transfer Dial 350/425 0.75 on, 0.75 off, repeat
Voice Mail 440 0.6 on, off
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