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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. International call - Wikipedia

   en.wikipedia.org/wiki/International_call

   The calls were transmitted by cable, communications satellite, radio, and more recently, fiber optics and Voice over Internet Protocol (VoIP). International direct dialling was introduced in the 1970s, so calls can be dialed by country code without an operator. International calls can be paid via telephone card (aka phone

4. Windows Live Call - Wikipedia

   en.wikipedia.org/wiki/Windows_Live_Call

   Phone Call - PC-to Phone voice calls to landline and wireless numbers anywhere in the world (charges applied) The Phone Call service utilized Windows Live Messenger and Voice over Internet Protocol technology to provide users an inexpensive way to make domestic and international phone calls from a computer. [1]

5. Receiving unexpected international calls? What you need ... - AOL

   www.aol.com/receiving-unexpected-international...

   There are several reasons why you might be receiving calls from unfamiliar international numbers. Wangiri scam: Scammers use automated systems to call thousands of numbers, disconnecting after one ...

6. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Many offer unlimited domestic calling and sometimes international calls for a flat monthly subscription fee. Phone calls between subscribers of the same provider are usually free when flat-fee service is not available. [12] A VoIP phone is necessary to connect to a VoIP service provider. This can be implemented in several ways:

7. 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.