AT&T System 85 manual Call Progress Tones

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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