This isn't a problem, we can custom compile from source any version of asterisk you'd like, maybe 13 or so, or we can deploy an known distro that you might want to use, FreePBX, PBXinaFlash, Elastix, etc... then fire this tool at it!
This is something we can get start on pretty quickly. If you'd like to chat via Skype or on the phone to go over details and timelines, just let me know. If you're ready to jump in and get started, I'm available ASAP.