dialling tone - meaning and definition. What is dialling tone
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What (who) is dialling tone - definition

TELEPHONY SIGNAL SENT BY A TELEPHONE EXCHANGE OR PRIVATE BRANCH EXCHANGE (PBX) TO A TERMINATING DEVICE, SUCH AS A TELEPHONE
Dialling Tone; Dial Tone; Dialtone; Dial-tone; Dialling tone; Secondary dialtone; Second dialtone; Secondary dial tone

dialling tone         
(dialling tones)
The dialling tone is the noise which you hear when you pick up a telephone receiver and which means that you can dial the number you want. (BRIT; in AM, use dial tone
)
N-COUNT
dialling tone         
(N. Amer. dial tone)
¦ noun a sound produced by a telephone that indicates that a caller may start to dialect
dial tone         
(dial tones)
The dial tone is the same as the dialling tone
. (AM)
N-COUNT

Wikipedia

Dial tone

A dial tone is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call. The tone stops when the first dialed digit is recognized. If no digits are forthcoming, the partial dial procedure is invoked, often eliciting a special information tone and an intercept message, followed by the off-hook tone, requiring the caller to hang up and redial.