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Internet Protocol (IP) Telephony is a general term for a family of transmission technologies for delivery of voice communications over IP.
IP Telephony is also known as VoIP (Voice Over IP) and is used to transfer packets of the human voice.
According to Wikipedia IP Telephony is:
"Internet telephony refers to communications services - voice, facsimile, and/or voice-messaging applications - that are transported via the Internet, rather than the public switched telephone network (PSTN). The basic steps involved in originating an Internet telephone call are conversion of the analog voice signal to digital format and compression/translation of the signal into Internet protocol (IP) packets for transmission over the Internet; the process is reversed at the receiving end."