MOH not work on Ring groups


I don’t know here i could send this problem. My problem is :
My provider must be using RINGING information from inboud routes (ok)
I use Ring groups with "Play Music On Hold? " = default .
If incoming call, i have a “ringing” and not MOH.
Otherwise, if i record an announcement, and i use this option, then i have a MOH but not annoucement.!

Will be a freepbx problem?

oups, i use trixbox 2.2. patch asterisk V 1.2.20 and freepbx 2.2.2.

thank for your help