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2. 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 ...

3. List of VoIP companies - Wikipedia

   en.wikipedia.org/wiki/List_of_VoIP_companies

   DSL services and Australia's National Broadband Network CallFire: Santa Monica: United States: Web-based VoIP Comwave: Toronto: Canada: Web and Mobile applications, VoIP telephone service, broadband internet providers, and commercial telecommunication service Fastweb: Milan: Italy: Landline, broadband Internet, and digital television services ...

4. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

5. Phone Power - Wikipedia

   en.wikipedia.org/wiki/Phone_Power

   A privately owned company founded in 2005, Phone Power provides telecommunications service in 48 states in the U.S. Phone Power’s customer service is based in the USA. Customers of Phone Power vary from single-line residential service to corporate call centers and SIP Trunking. The company promotes itself with the slogan “communications ...

6. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   On mobile devices, e.g., a 3G handset or USB wireless broadband adapter, the IP address has no relationship with any physical location known to the telephony service provider, since a mobile user could be anywhere in a region with network coverage, even roaming via another cellular company. At the VoIP level, a phone or gateway may identify ...

7. 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.