| Internal ring |
Announces a call placed from another phone on the telephone
system (internal).
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| External ring |
Announces a call incoming from the public network.
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| Call back ring |
Announces a call back has been activated and will place the call
after the handset is lifted.
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| Confirmation |
Confirms acceptance of a keyed command, e.g. call back.
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| Dial tone |
Standard sound heard when handset is lifted and the line is ready to accept dialling.
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| Ring tone |
Normal tone heard when the called phone should be ringing.
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| Busy tone |
Normal tone heard when the called phone is in use ("engaged").
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| Equipment busy |
Unusual tone heard if there are no lines currently available to the
called phone.
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| Diverted |
Advises that calls to this phone are being diverted. Confirms a
follow-me.
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| Call waiting |
Announces that an incoming (external) call is waiting. Injects a
tone onto the line that can drop fax and modem calls.
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| Conference |
Periodic tone warning that there are more than two parties involved in the call.
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| Unobtainable |
Tone heard when there is a fault condition or the dialled number is not
allocated or handset left off. |