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I have installed the newest version of 3cx and updated my Fanvil X4G handsets with the latest firmware using 3CX administration console. We are using a patton analog 4114 FXO with 4 PTSN lines, when a extension receives a call from outside via the DID line in, extension user answers successfully, however when a call from outside comes in on the same number all the extension user hears while on another call is a beep, however there is no way to switch to this call, how can we accomplish this?