Jargon Buster:

VOIP is an acronym for Voice Over IP, or in more common terms it simply means "phone service over the Internet."

Internet telephony products are sometimes called IP telephony, Voice over the Internet (VOI) or Voice Over IP (VOIP) products.

VOIP is the transmission of voice over packet-switched networks. If you are not familiar with the term "packet switched networks", then all you need to know is that packet-switched networks carry all our data around, between computers both within company networks and also throughout the internet. Traditionally telephone systems (telephony systems) which predate the invention of packet-switched networks use different systems.

VOIP is also called VoIP lines or trunks.

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