VoIP Auditing Tools

Ok, so i am going to go attend a hacking course in Hack in The Box with The Grugq. Yes guys, i do know how to audit VoIP, but i would love to learn advanced VoIP hacking from the best of the west. If you guys read the HITB website, he developed a tool called Tactical VoIP Toolkit which does basic and advanced attacks. Just a few minutes ago, i found another commercial tool called VoIPaudit which cost USD $10000. Personally, i feel that open source tools are much and way better than close source. I don't know how this tool fair, but i think it is way too pricey to buy. Well you can get it from here if you have the money to spare. I will update you guys once i try the tool from the Grugq. And yes, i am still working on basic VoIP auditing on my PBX right now, i had captured screenshots and am going to release here once i am done. Let me know what you guys think?