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2. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Voice over Internet Protocol (VoIP), [a] ... The standard is considered of critical importance for delay-sensitive applications, such as voice over wireless IP.

3. The Benefits of VoIP Phone Systems - AOL

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

   Over 30% of U.S. companies use Voice over Internet Protocol (VoIP) phone systems. Many switch from conventional services to realize the benefits of VoIP, including lower costs, operational ...

4. 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).

5. Internet - Wikipedia

   en.wikipedia.org/wiki/Internet

   The Internet (or internet) [a] is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) [b] to communicate between networks and devices. It is a network of networks that consists of private , public, academic, business, and government networks of local to global scope, linked by a broad array of ...

6. Internet telephony service provider - Wikipedia

   en.wikipedia.org/wiki/Internet_telephony_service...

   An Internet telephony service provider (ITSP) offers digital telecommunications services based on Voice over Internet Protocol (VoIP) that are provisioned via the Internet. ITSPs provide services to end-users directly or as whole-sale suppliers to other ITSPs.

7. Telephony - Wikipedia

   en.wikipedia.org/wiki/Telephony

   Telephony now includes the technologies of Internet services and mobile communication, including video conferencing. The new technologies based on Internet Protocol (IP) concepts are often referred to separately as voice over IP (VoIP) telephony, also commonly referred to as IP telephony or Internet telephony. Unlike traditional phone service ...