I need to build a test suite for a service provider's SIP service infrastructure. The box will initiate and accept calls and verify that SIP messages are valid, audio media is two-way, and call control features are also working. My plan for the moment is to use FreeSWITCH and to trigger the outbound calls via ESL, and then use packet capture and Perl modules for parsing and verifying the SIP messages. What are other options? I see that SIPp doesn't look too bad, but I never worked with it. This page lists mostly outdated and closed-source packages, so not very helpful: http://www.voip-info.org/wiki/view/Protocol+Verification+and+Testing I'm planning to publish as much of my work as possible as open source. Any input will be appreciated. thanks, stan