miTester for SIP is an automated SIP testing tool designed and developed to take care of the complex pre-deployment testing of SIP applications effectively. This SIP testing tool can be used to simulate SIP call-flows and automate functional, regression and fault injection tests. Learn more about this tool here.

SIPp is a free open source test tool/traffic generator for the SIP protocol. It includes a few basic SipStone user agent scenarios (UAC and UAS) and establishes and releases multiple calls with the INVITE and BYE methods. It can also read custom XML scenario files describing very simple to complex call flows.

sipsak is a small command line tool for developers and administrators of Session Initiation Protocol (SIP) applications. It can be used to perform simple tests on SIP applications and devices. Visit the sipsak site to learn more.