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Voice over IP (VoIP) is a computer-integrated telephone technology used for the delivery of voice communications and multimedia content over the Internet. It may be cloud-based, semi cloud-based or more internally-based using a local network. Cloud communications are Internet-based voice and data communications where telecommunications applications, switching and storage are hosted by a third-party outside of the organization using them, and they are accessed over the public Internet.
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A rotary phone circa the 1940s was quite a technological marvel in its day, but we have come a long way since then. The essential elements of these telephones were a microphone to speak into and an earphone which reproduced the voice during a call. In addition, a ringer of some type produced sound to announce an incoming telephone call, and the rotary dial was used to enter a telephone number when initiating a call. This device was connected by a pair of wires to the telephone network, and that was pretty much it.