SIP Tester is a free load testing tool that allows users to conduct stress and performance tests on their SIP hardware or software. It is capable of making and receiving multiple SIP calls at the same time, with call flows defined by CallXML-like scripts. These scripts can be designed to simulate various scenarios that could lead to the failure of the SIP hardware or software being tested. It also has features such as the ability to immediately abort calls, make 100 calls per second, send and receive DTMF (SIP INFO), REFER and RE-INVITE commands within a call, record and play audio, send and receive faxes, and check recordings.
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