What Is Internet Telephony?

Internet telephony lets you make real-time voice, fax and even video calls over the Internet. Many small businesses are experimenting with Internet telephony, mainly because it can significantly reduce telecommunications costs.

You might also hear it called voice over IP (VoIP) or voice over the Internet (VoI). A somewhat synonymous term, IP telephony most commonly refers to voice calls routed over a private intranet or wide area network (WAN), as opposed to the public Internet.

Incoming Calls Break Net Connection

Solutions:
If you have Call Waiting on the phone line that you're using to access the Net, incoming calls will interrupt your Net connection. Depending on how your connection software responds to such disruption, you might have to reboot your computer as a result. If incoming calls pose a problem for you:

Temporarily disable Call Waiting on your phone line by dialing *70 (some connection software can do this for you automatically). On an office line, dial "9" first. Call Waiting will automatically be restored when you disconnect. Exact procedures may differ by region and phone company; contact your phone company for details.
Switch to a phone line that does not have Call Waiting.
Permanently cancel the Call Waiting service on your phone line.

What is communication system?

In telecommunication, a communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole.

The components of a communications system serve a common purpose, are technically compatible, use common procedures, respond to controls, and operate in unison.

Telecommunications is a method of communication (e.g., for sports broadcasting, mass media, journalism, etc.).