00:44:53 CQ (100) Q12. Dial tone is a signal which is sent by (A) Calling party to switching machine (B) Switching machine to calling party (C) Called party to switching machine (D) Switching machine to the called party
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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.
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