This is done at the Central Office, or a neighborhood multiplexer called a "SLC" for Subscriber Line Carrier. On a POTS interface, this signal is created by superimposing ringing voltage atop the −48 VDC already on the line. For mobile phones, the network sends a message to the recipient's device, which may activate a sound, or a visual or vibrating indication. The ringing current originally operated an electric bell. Landline telephones typically receive an electric alternating current signal, called power ringing or ringing signal, generated by the telephone exchange to which the telephone is connected. Customers can buy or generate custom ringtones for installation on the device.Ī telephone rings when the telephone network indicates an incoming call, so that the recipient is alerted of the call attempt. Originally referring to and made by the electromechanical striking of bells, the term now refers to any sound on any device alerting of a new incoming call-up to and including recordings of original telephone bells.Įlectronic telephones, especially smartphones, are manufactured with a preloaded selection of ringtones. A ringtone, ring tone or ring is the sound made by a telephone to indicate an incoming call.
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