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GENERAL INFORMATION
Call Progress Tones
The following call progress tones are generated by the system:
TONE FREQUENCY PATTERN (In ms)
Ringback Tone 440 Hz + 480 Hz 1000 on, 3000 off; repeated
Bridging Warning Tone* 440 Hz 500 on, 15000 off; repeated
Busy Tone 480 Hz + 620 Hz 500 on, 500 off; repeated
Call Waiting Tones
Internal 750 Hz + 20 Hz 100 on; not repeated
External or Handled
by Attendant 750 Hz + 20 Hz 100 on, 100 off, 100 on;
not repeated
Priority Call 750 Hz + 20 Hz 100 on, 100 off, 100 on,
100 off, 100 on;
not repeated
Coverage Tone 440 Hz 600 on, followed by silence;
not repeated
Confirmation Tone 350 Hz + 440 Hz 100 on, 100 off, 100 on,
100 off, 100 on
followed by silence;
not repeated
Dial Tone 350 Hz + 440 Hz Continuous
Intercept Tone 480 Hz & 620 Hz 250 on (480 Hz),
250 on (620 Hz); repeated
Reorder Tone 480 Hz + 620 Hz 250 on, 250 off; repeated
Call Waiting
Ringback Tone 440 Hz + 480 Hz; 1000 on (440 Hz + 480 Hz),
440 Hz 200 on (440 Hz), 2800 off;
repeated
* This tone is used with the Busy Verification and Executive Override features and Service
Observing when the warning tone is enabled.
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