Old favorite Wireshark has grown far past its simplistic roots, expanding its analysis capabilities into areas that cause network admins the most pain these days, including VoIP and wireless troubleshooting. No protocol analyzer comes close to the flexibility, extensibility, and user base that supports this stellar project. Wireshark's visual display of low-level communications is a must for finding and eliminating problems that are annoying, troubling, and specific to VoIP. Once VoIP traffic is filtered for analysis, monitoring SIP conversations is a piece of cake. This tool is one that should always be with you. FULL REPORT ...