Found this in the definity pocket reference book.... hope it helps.
[tt]Tone Frequency Pattern (ms)
Answerback 3 tone 2225 Hz 3000 on, followed by silence; no
repeat
Answerback 5 tone 2225 Hz 5000 on, followed by silence; no
repeat
Bridging warning tone1 440 Hz 1750 on, 12,000 off, 650 on;
repeated
Busy tone 480 Hz + 620 Hz 500 on, 500 off; repeated
Call waiting tones:
internal
External or handled by
attendant
Priority call
440 Hz
440 Hz
440 Hz
200 on, followed by silence; no
repeat
200 on, 200 off, 200 on followed by
silence; no repeat
200 on, 200 off, 200 on, 200 off,
200 on followed by silence; no
repeat
Call waiting ringback tone 440 Hz + 480 Hz;
440 Hz
900 on (440 Hz + 480 Hz),
200 on (400 Hz), 2900 off;
repeated
Centralized attendant call:
incoming call identification
480 Hz & 440 Hz
& 480 Hz
100 on (480 Hz), 100 on (440 Hz),
100 on (480 Hz), followed by
silence;
no repeat
Coverage tone 440 Hz 600 on, followed by silence; no
repeat
Confirmation tone 350 Hz + 440 Hz 100 on, 100 off, 100 on, 100 off,
100 on followed by silence; no
repeat
Continuous confirmation
tone
350 Hz + 440 Hz 100 on, 100 off; repeated
Dial tone 350 Hz + 440 Hz continuous
Dial zero, attendant
transfer, and test calls
Recall on don’t answer,
audible ringing
Hold recall, hold
confirmation
Camp-on recall, camp-on
confirmation
440 Hz
440 Hz
440 Hz
440 Hz
100 on, 100 off, 100 on followed by
silence; no repeat
300 on, followed by silence; no
repeat
50 on, 50 off, 50 on, 50 off, 50 on,
50 off, 50 on, 50 off, 50 on followed
by silence; no repeat
100 on, followed by silence; no
repeat
Executive override tone 440 Hz 3000 on, followed by silence; no
repeat
Intercept tone 440 Hz & 620 Hz 250 on (440 Hz), 250 on (620 Hz);
repeated
Precedence audible alert
tone
440 Hz + 480 Hz 1600 on, 300 off; repeated
Recall dial tone 350 Hz + 440 Hz 100 on, 100 off, 100 on, 100 off,
100 on, 100 off, followed by
continuous dial tone
Reorder tone 480 Hz + 620 Hz 250 on, 250 off; repeated
Remote hold tone 440 Hz 50 on, 50 off; repeated
Ringback tone 440 Hz + 480 Hz 1000 on, 3000 off; repeated
Voice signaling tone 440 Hz 1000 on, followed by silence; no
repeat
Zip tone 480 Hz 500 on, followed by silence; no
repeat[/tt]
Carpe dialem! (Seize the line!)