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Voice Over Internet Protocol (VoIP) or (Voice Over IP), often known as IP telephony, is a technique and collection of technologies for delivering voice conversations and multimedia sessions over IP networks, including the Internet.
The provision of communications services (voice, fax, SMS, and voice messaging) through the Internet as opposed to the public switched telephone network (PSTN), generally known as regular telephone service, is explicitly referred to as Internet telephony, broadband telephony, and broadband phone service (POTS).

For information about VOIP, please view guidance on this topic from the following resources:

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