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970 ISDN Telephone
Tones and Their Meanings
You may hear any of the following tones as you use
your telephone:
Network tones
Busy signal: A low-pitched tone repeated 60 times a
minute; indicates the number dialed is in use.
Confirmation tone: Three tones; indicates a feature
activiation or cancellation has been accepted.
Dial tone: A continuous tone; indicates dialing can
begin.
Error tone: An alternating high and low tone;
indicates a dialing error, a denial of the service
requested, or a failure to dial within a preset interval
(usually 10 seconds) after lifting the handset or dialing
the previous digit.
Reorder tone: A fast busy signal; indicates a call is
blocked.
Local tones
Local error tone: A low tone; indicates an incorrect
button press.
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