Asterisk – Terminology Recap

Terminology Recap

POTS

Plain old telephone service, the basic analog phone line most folks have in their homes.

Fax

Facsimile, a method of sending a copy of a paper document over an analog telephone line.

Modem

Modulator/demodulator, a device that connects computer systems or fax machines by transmitting signals using analog signals.

CO

Central office, the phone company’s switching center that provides POTS service to the surrounding area.

PCM

Pulse ccde modulation, a way of storing an audio signal as a bit stream.

CELP

Code-excited linear prediction, a compression codec used in advanced VoIP codecs. CELP reduces the number of bits necessary for successful transmission of the sound, but it does so by degrading the audio signal somewhat.

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