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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. 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.

4. Call-through telecom - Wikipedia

   en.wikipedia.org/wiki/Call-through_telecom

   The calls do not have to originate on Internet in order to use VoIP. A caller can dial a physical phone number, which is then routed over VoIP to the point when it is terminated at the recipient's physical phone line (fixed landline or wireless mobile or cell line), even in another country. This is what call-through telecom operators do - they ...

5. Least-cost routing - Wikipedia

   en.wikipedia.org/wiki/Least-cost_routing

   Mobile number portability (MNP) is a service that makes it possible for subscribers to keep their existing mobile phone number when changing the service provider (or mobile operator). With number portability now in place in many countries, LCR providers can no longer rely on using only a portion of the dialed telephone number to route a call.

6. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Some are not accessible from pay phones. Calls from pay phones assess the toll-free owner an additional fee in the U.S., as mandated by the FCC. Although toll-free numbers are not accessible internationally, many phone services actually call through the U.S., and in this case the toll-free numbers become available.

7. 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 ...