ok - it is getting out of hand 
so i created a Voxbone trunks with peer details such as this:
[voxbone]
disallow=all
allow=g729
etc…etc…
and after i save this into freepbx, it messes it up and when i reload it gets rid of disallow=all —> so in the end i get stuck with ulaw
—> only way to fix it is to go and do it manually
ANY SUGGESTIONS???