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2. List of VoIP companies - Wikipedia

   en.wikipedia.org/wiki/List_of_VoIP_companies

   VoIP and mobile phone services sipservice: Winterthur: Switzerland: VoIP service provider TELES AG: Berlin: Germany: VoIP services VirtualPBX: San Jose, CA: United States: Cloud-based telephone systems VocalTec: West Palm Beach and Netanya: United States and Israel: Telecom equipment provider VoiceHost: London: United Kingdom: VoIP and DSL ...

3. 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 three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. [ 1 ] [ 2 ] In 2016, MVNOs across the nation such as Metro PCS , Boost Mobile , Cricket Wireless , and TracFone brands served about 36 million ...

4. 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. ITSPs use a variety of signaling and multimedia protocols, including the Session ...

5. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Voice over Internet Protocol (VoIP), [a] also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet.

6. Sonic (ISP) - Wikipedia

   en.wikipedia.org/wiki/Sonic_(ISP)

   Sonic has some control of the line such as not enforcing transfer caps, but customers are on AT&T's IP space. VoIP connection defaults to G.729ab and uses less than 50 Kbps. FlexLink – midband Ethernet service offering symmetric speeds from 1.5 Mbit/s to 500 Mbit/s. AT&T DSL – ADSL service delivered over an AT&T voice line. This service is ...

7. AT&T - Wikipedia

   en.wikipedia.org/wiki/AT&T

   AT&T Inc.is an American multinational telecommunicationsholding company headquartered at Whitacre Towerin Downtown Dallas, Texas.[4] It is the world's third-largest telecommunications company by revenueand the second-largest wireless carrier in the United Statesbehind Verizonbut ahead of T-Mobile.[5] As of 2023, AT&T was ranked 13th on the ...