Siti simili a Gnugk.Org

Program that allows two parties to hold a secure voice conversation using Linux and TCP/IP.

SIP based phone. Supports video, communication encryption and push-to-talk.

Siproxd - a masquerading SIP Proxy Server

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Peer to peer voice service. Users may call landlines and cellphones for a fee; users may call each other for free. Source code is not available.

Free, secure and fast downloads from the largest Open Source applications and software directory - SourceForge.net

Offering commercial software focused on PC-to-UNIX connectivity.

Sangoma is a leading provider of hardware and software components that enable or enhance IP Communications Systems for both telecom and datacom applications.