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2. 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 ...

3. 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."

4. 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 ...

5. International telecommunications routes - Wikipedia

   en.wikipedia.org/wiki/International...

   A carrier receives calls in country A, turns them into IP packets using an IP gateway device and sends them over an IP connection (public or dedicated) to another carrier or ISP in country B, which re-assembles the voice call and sends it out from a PBX. The cost is composed of the cost to convert the call, IP connectivity, convert the call back.

6. International call - Wikipedia

   en.wikipedia.org/wiki/International_call

   It can also be made with the use of VoIP applications on smart phones. Such applications include Skype, Google Voice, Fring, and others. Some applications allow users to make free international calls, which are paid by sponsors. These applications make use of the Wi-Fi or 3G connection on the phones to make calls. Alternatively, calls can also ...

7. Viber VoIP iPhone app: 3G calling, no registration, and ... - AOL

   www.aol.com/news/2010-12-04-viber-voip-iphone...

   Out of nowhere, Viber has swooped in to crush the dreams of Skype and every other VoIP provider out there, and if these guys can reach critical mass, avid iPhone users will certainly be able to ...