FGCom is a command line, voip, virtual radio software built around Asterisk. It works together with the FlightGear flight simulator to bring realistic radio communications to your FlightGear sessions. There are some FlightGear wiki articles on fgcom here, here, and here.
FGComGui is a simple gui front end to fgcom, which aims to make using fgcom easy and friendly. It has currently been tested on Linux and Windows operating systems, with plans for a Mac version at some point in the (hopefully near) future.
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