This is the science of turning sounds into another type of media (radio, Light, electrical signals, etc), sending them to another location, usually far away, and then back into sound.

Telephony software is software that can be installed on your computer to send sound via modem, or via IP (VoIP). There is also telephony software to turn a computer in an advanced fax, and answering machine.
Telephone: You say "hello", it gets turned into electrical signals, travels through the wire, then to the phone on the other end, and back into sound, so that the person on the other end hears "hello".

VoIP (Voice over IP): You say "hello" into the mic, the computer turns it into 1s and 0s, sends it into an IP packet, into you cable modem, your ISP will possibly turn that into a fiber optic signal, back into an electrical signal at your VoIP provider. The VoIP provider will then send it to the phone it needs to go, OR send it to the other VoIP recipient.
by Steven L. June 8, 2005
similar to telepathy, its when your waiting for a text and check your phone to find nothing. but while your checking your phone you get the text that you were looking for.
Man, I've been waiting so long for that picture of Olivia, why hasn't she sent it yet. I think I'll check my phone. damn noth-OH SHIT THAT'S HOT.

i must have telephony.
by Handy Jandy June 28, 2011
the act of using telepathy over the telephony.
Phone operator 1: I just had the worst caller...
Phone operator 2: Yeah? What did you have to do?

Phone operator 1: I used my telephony to slap them 3 times... I don't think they'll call again, but if they do I'll have to knock them out.
by Narc0letipc May 4, 2010