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Protocols used to carry voice signals over the IP network are commonly referred to as Voice over Internet Protocol or VoIP protocols. Voice over IP traffic can be deployed on any IP network, including ones lacking a connection to the rest of the Internet, for instance on a private building-wide LAN.
The voice data flows over a general-purpose packet-switched network, instead of dedicated legacy circuit-switched telephony transmission lines, allowing you to route all calls through your VoIP handset when connected to the network irrespective of your location, making this method of telephony extremely appealing to those who travel or larger companies who have offices across the country.