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Twinkle is free open-source application for voice telecommunication. This program was created especially for Linux system and using Qt interface for its graphical interface. Moreover, it can be used as IP phone to IP phone telecommunication. Media streams are going via RTP. This application also supports messages exchanging and contact lists between users. You may check lots of other useful features available thanks to this program.
That is a special voice application working on voice over IP and designated for Android OS. You may install this app to your smartphone and use it for making cheap outgoing calls or receiving free VoIP calls to your mobile. You do not need any other hard equipment.