SIPp is an open-source performance testing tool specifically designed for the Session Initiation Protocol (SIP). It is widely used to simulate and test SIP-based applications, including VoIP systems, PBX servers, and SIP proxies. SIPp provides powerful capabilities for generating SIP traffic, running scenario-based tests, and evaluating the performance and scalability of SIP solutions.

Features of SIPp:

• Built-in support for common SIP scenarios (UAC and UAS).
• Customizable XML-based scenarios for flexibility.
• Real-time statistics for call performance analysis.
• Ability to simulate thousands of simultaneous calls.
• Support for authentication and encryption mechanisms (e.g., TLS).
• Extensible with custom scenarios and external scripts.

To Check SIPp version, run: $ sipp -v

Disclaimer: SIPp is a powerful testing tool that requires careful configuration to ensure accurate results. It is provided as an open-source utility, with no warranty, express or implied. Users should understand the risks of stress testing in production environments and take appropriate precautions.