Windows Telephony Overview
Telephony. Isn't that when you know what someone on the phone is going to say before they say it?
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There are also several kinds of applications that don't require a human on both sides of the call. If you like, you can install an application on your computer that will answer the phone when you call and provide access to what I like to call "Excel From Abroad." By using touch-tones or your voice, you can access the data on your computer from any phone in the world. A computer with multiple phone lines can provide an Integrated Voice Response (IVR) application. IVR applications include auto-attendants to route phone calls, voice mail systems to take messages and audiotex systems to provide information from your local bank or newspaper.
Or, we could use the phone as a microphone and speaker without involving the telephone network at all.