telephony

[ tuh-lef-uh-nee ]
/ təˈlɛf ə ni /

noun

the construction or operation of telephones or telephonic systems.
a system of telecommunications in which telephonic equipment is employed in the transmission of speech or other sound between points, with or without the use of wires.

Origin of telephony

First recorded in 1825–35; telephone + -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for telephony

telephony

/ (tɪˈlɛfənɪ) /

noun

a system of telecommunications for the transmission of speech or other sounds
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012