One card such as OpenSwitch6 of voicetronix having FXS(station) ports and the FXS port connect to a phone. Here is the flow: 1.Pick up the receiver of the phone, the FXS port will get callin event. 2.Dial the number of callee, the FXS port will get overlapped callin event with a number of callee. 3.FXS answer the call.
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