Examples from the Web for telephony
Sometimes known as telephony metadata, this information is comprised of the time, duration and number dialed of a phone number.Spy Chief: We Should’ve Told You We Track Your Calls|Eli Lake|February 18, 2014|DAILY BEAST
It's telephony's biggest "killer app" since Skype or even voice-over-IP.
Telephony, it is clear, both from one's own experience and from reading the letters in the papers, is not yet an exact science.Adventures and Enthusiasms|E. V. Lucas
This is a function that in telephony is scarcely of less importance than the purely transforming function.
The foregoing are problems of making telegraphy a by-product of telephony.Cyclopedia of Telephony and Telegraphy, Vol. 2|Kempster Miller
Sometimes it is called a system of “multiplex” telephony because it permits more than one message at a time.Letters of a Radio-Engineer to His Son|John Mills
Frequently in telephony, the electromagnets are provided with more than one winding.