Voicemail - bespoke OGMs

Hi All

In the absence of aussievoip I thought I’d ask here - how do I create bespoke OGMs for voicemail?

I don’t mean how do I record them, I mean where should I put wav files and how do I get * to play them?

With vanilla *, I just put busy.wav and unavail.wav files in each voicemail directory and it picked them up automagically, tried that with freepbx to no avail

Many thanks