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OpenWengo is an alternative broadband telephone company, offering consumers unlimited free calling worldwide. It is aiming at providing a simple and reliable communications tool, featuring superior audio quality, video, and chat. OpenWengo is an open source VoIP project sponsored by a French telecom carrier. The project is based on EXOSIP, OSIP, ORTP, and FFMPEG libraries and supports voice as well as video communications using SIP protocol.
Version 2.0 features improved file transfer, DTMF support, and better overall stability.