AT&T 7402 - Manual (Page 25)

Tones and Their Meanings
Ringing tones are produced by an incoming call. Feedback tones are those that
you hear through the handset (receiver) or speaker.
Ringing Tones
1 ring — A call from another extension.
2 rings — A call from outside or from the attendant.
3 rings — A priority call from another extension, or a call from an Automatic
Callback call you previously placed.
half ring — A call redirected from your voice terminal to another because Send
All Calls or Call Forwarding — Follow Me is active.
intercom ring — A call directed to you by the Intercom feature.
Feedback Tones
busy tone — A low-pitched tone repeated 60 times a minute; indicates the
number dialed is in use.
call-waiting ringback tone — A ringback tone with a lower-pitched signal at
the end; indicates the extension called is busy, but the called party has been given
a call-waiting tone.
confirmation tone — 3 short bursts of tone; indicates a feature activation or
cancellation has been accepted.
coverage tone — 1 long burst of tone; indicates that your call will be sent to
another extension to be answered by a covering user.
dial tone — A continuous tone; indicates that dialing can begin.
intercept/time-out tone — An alternating high and low tone; indicates a
dialing error, a denial of the requested service, or a failure to dial within a preset
interval (usually 10 seconds) after lifting the handset or dialing the previous
digit.
recall dial tone — 3 short bursts of tone followed by a steady dial tone;
indicates that the feature request has been accepted and dialing can begin.
reorder tone — A fast-busy tone repeated 120 times a minute; indicates all
trunks are busy.
ringback tone — A low-pitched tone repeated 15 times a minute; indicates the
number dialed is being rung.
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