Phone - a device to end dial-up link; depth. parts at: handset, where there is processing of speech sounds into an electrical signal (microphone) or reverse operation (the handset), dials or a keyboard, producing selective pulses, and the transducer electrical signal to a signal (visual or auditory), citing the subscriber.

The traditional approach to distinguish between telephony-related issues:

* Komutacyjnymi devices, responsible for compiling calls (exchanges, hubs, gateways or gateways)
* Linear devices and broadcast media (copper and fiber optic cables, radio, frames, multiplexing devices),
* Subscriber devices, also called terminals (telephone, fax, modem)
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