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Sipp is a performance testing tool for the SIP protocol. Its main features are basic SIPStone scenarios, TCP/UDP transport, customizable (xml based) scenarios, dynamic adjustement of call-rate and a comprehensive set of real-time statistics. SIPp can also send media (RTP) traffic through RTP echo and RTP / pcap replay. Media can be audio or audio+video.
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It enables yo to make calls directly via any computer running Windows.
Have you ever been on the Pole? Biting frost, snowstorms, blizzards...
miniSipPhone is a free-to-use app that allows you to make free calls.