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Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call. Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell.
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When the call routing is successful and the receiving telephone is not already in a call, the destination telephone receives an electrical signal, called power ringing, or the ring tone, to alert the recipient of the incoming call. During this period of alerting, the caller also receives a distinctive signal, audible ringing, also called ...
The exchange then places a reverting call to the originating line, causing the telephone to ring. When answered, the exchange plays a verification tone. The verification tone is issued so that telephone subscribers cannot easily use the ringback system as an intercom between multiple stations in a residence on the same line by taking the ...
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A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail.
For a local call, the operator inserted the front cord of the pair (ringing cord) into the called party's local jack and started the ringing cycle. For a long-distance call, the operator plugged into a trunk circuit to connect to another operator in another bank of boards or at a remote central office. In 1918, the average time to complete the ...
Closeup of male hand holding telephone receiver while dialing a telephone number to make a call using a black landline phone. With retro filter effect. ... Only about 5% of the households AT&T ...