AT&T Definity ISDN 7507 - Manual (Page 50)

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call waiting tone — One, two, or three beeps of high-pitched tone, not repeated;
indicates an incoming call is waiting to be answered. Number of beeps designates
the source: 1 for an internal call, 2 for an outside or attendant call, 3 for a priority
call.
confirmation tone — Three short bursts of tone; indicates a feature activation or
cancellation has been accepted.
coverage tone — One short burst of tone; indicates your call will be sent to another
extension to be answered by a covering user.
dial tone — A continuous tone; indicates dialing can begin.
intercept/time-out 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.
recall dial tone — Three short bursts of tone followed by a steady dial tone;
indicates 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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