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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. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   This is a comparison of voice over IP (VoIP) software that examines applications and systems used for conducting voice and multimedia communications across Internet Protocol (IP) networks. VoIP technology has transformed telecommunications by offering alternatives to traditional telephony systems while providing enhanced features and cost savings.

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. List of mobile network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_network...

   The top five wireless providers operate nationwide wireless networks which cover most of the population in the United States, while smaller carriers provide native network coverage across selected regions of the United States while supplementing nationwide coverage through roaming agreements with other carriers.

6. Category:VoIP companies of the United States - Wikipedia

   en.wikipedia.org/wiki/Category:VoIP_companies_of...

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7. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."