I have been looking for AvantFax integration, and I found this http://www.adminsparadise.com/ You could get some ideas in that distro. I haven't found the sources (neither for Elastix) but as it is GPL to mabe you could somehow collaborate. Nice graphic installer, compiles main packages from sources (I don't know if this is really better, but takes a lot time for first installation), AvantFax integration... and some kind of IP TV. I'm finishing the installation in a vmware machine sometime tonight (it really takes much longer than Elastix or Trixbox). I'll share my experiences soon.