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It has been about 5 years since the first SIP Inspector was released. Over time, I have been improving it to turn it into a simple yet very capable tool. It can be used in various situations and is powerful enough to do load testing and test automation. It has been my pleasure to see people show interest and use it over years. Employees in industry's leading companies use it on a daily basis. While it pleased me to see the program become popular, rarely did I receive financial gratification for the time and effort put in its development. Thanks to all who supported me so far. You know who you are. For your good deeds you will be given licenses for free. From today on, SIP Inspector is a paid program and can no longer be used for free.

SIP Inspector Pro is an alternative to SIPp.

SIP Inspector is a must have for:
SIP signaling troubleshooting
Interoperability and conformance testing
Hard to reproduce signaling scenarios
Stress testing
Learning tool
Regression testing
Emulate particular SIP server or clients
Automatically handles multiple scenarios serially
Multiple dialogs per scenario
Handles multiple concurrent calls (dialogs)