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2. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Voice over Internet Protocol (VoIP), [a] also known as IP telephony, refers to a set of technologies used for voice communication sessions over Internet Protocol (IP) ...

3. VoIP phone - Wikipedia

   en.wikipedia.org/wiki/VoIP_phone

   A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. [1] This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN).

4. The Benefits of VoIP Phone Systems - AOL

   www.aol.com/benefits-voip-phone-systems...

   According to the U.S. Federal Communications Commission (FCC), "Voice over Internet Protocol (VoIP) is a technology that allows you to make voice calls using a broadband Internet connection ...

5. Session Initiation Protocol - Wikipedia

   en.wikipedia.org/wiki/Session_Initiation_Protocol

   SIP connection is a marketing term for voice over Internet Protocol (VoIP) services offered by many Internet telephony service providers (ITSPs). The service provides routing of telephone calls from a client's private branch exchange (PBX) telephone system to the PSTN.

6. Telephony - Wikipedia

   en.wikipedia.org/wiki/Telephony

   Internet telephony is commonly known as voice over Internet Protocol (VoIP), reflecting the principle, but it has been referred with many other terms. VoIP has proven to be a disruptive technology that is rapidly replacing traditional telephone infrastructure technologies.

7. SIP trunking - Wikipedia

   en.wikipedia.org/wiki/SIP_trunking

   SIP trunking is a voice over Internet Protocol (VoIP) technology and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and unified communications facilities. [1]