Commonly used by a company within its private automatic branch exchange (PABX) telephone system, a keyphone (abbreviated as K/P, sometimes called a key station) is a telephone with the extra buttons and the intelligence to allow incoming calls to be transferred to other extensions. Extra lights, either on the phone console or in the handset, indicate the status of lines and extensions; extra keys facilitate connections between extensions and external lines. Analog, digital, and Internet-enabled versions of keyphones are available.
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