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Ringing noise from an electromechanical telephone Example of a short digital tune which could be used as a ringtone on a mobile phone. A ringtone is the sound made by a telephone to indicate an incoming telephone call. Originally referring to the sound of electromechanical striking of bells or gongs, the term refers to any sound by any device ...
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 ...
In this case the ringing state is sent by the host network and the tone is generated by the home network. In some instances, the tones are entirely generated by the local network or even by the telephone itself; this is increasingly common on VoIP-based services. In this case no distantly generated tones will be heard.
A ring generator or ringing voltage generator is a device which outputs 20 cycle sinusoidal AC at up to 110 volts peak to power bells or annunciators in one or more telephone extensions. [4] The output stops if a handset is taken off the hook. In terminology devised by phone phreaks, a ringing generator is a magenta box.
A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [ 1 ] for both routine and emergency communication on ships to allow communication between key ...
"Sound therapies are also helpful for tinnitus sufferers, which can be in the form of white noise, a fan, nature sounds, calming music, smartphone applications or any background sound."
Until frequencies began to be standardized in the 1960s, telephone signals varied from telephone exchange to exchange. The European Telecommunications Standards Institute (ETSI) recommendation for busy tone is a 425 Hz tone at -20dBm in a 0.5 s on/off cadence. This sequence was already in use in Portugal, Spain, The Netherlands, (West-)Germany ...
Some central office switches in the United States, notably older GTD-5 EAX systems, utilize a single frequency tone, 480 Hz, known as High Tone for this purpose. In either case, the tone is substantially louder than any other signal transmitted over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone.