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2. List of VoIP companies - Wikipedia

   en.wikipedia.org/wiki/List_of_VoIP_companies

   International calling service using VoIP and IVR Nfon: Munich: Germany: Cloud-based telephone systems Nextiva: Scottsdale, Arizona: United States: Cloud-based Communications, VoIP and IVR Ooma: Palo Alto, California: United States: VoIP communications for small businesses, home and mobile Radvision: New Jersey: United States

3. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

4. Phone Power - Wikipedia

   en.wikipedia.org/wiki/Phone_Power

   In 2010, Phone Power introduced the Global Plus Add On plan for international calling. This allowed an additional 1200 minutes to those same countries. In January 2011, Phone Power launched its free iPhone App, [11] allowing customers to use the included international calling on their mobile phones. The company also offered a “Zippy” USB ...

5. Textfree - Wikipedia

   en.wikipedia.org/wiki/Textfree

   TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying for an ad-free ...

6. 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."

7. 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.