3
Tones
Dial Tone
Steady tone you hear before you make a call.
Busy Signal
Pulsing tone that indicates you dialed a number that is being used.
Reorder Tone
Fast busy signal. This means that an invalid number was dialed, a service
feature was denied, or your handset has been off hook and inactive for
too long.
Special Dial Tone
An interrupted dial tone. This means you may proceed to use a feature.
Service Set Tone
A steady, high-pitched tone that indicates a feature was set or canceled.