Some voice call function is the architecture in the software, it represents in the user terminal, the only need of hardware is a computer with Internet connection, need to pick up the right sound equipment: this computer sound card, can let you hear each other voice speakers or headphones, and microphone allows you to enter the speech, to enable PCS to make this kind of network computer software, its professional name call software telephone; Most free software telephone service allows you to call computer to computer conversations, only the user if you want to use a computer to make calls to the public switched telephone network (PSTN) on a traditional phone or cell phone, most need to pay the monthly fee or points, one of the most famous software should be Skype phone,
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