No playback on inbound route

i’m playing around with asterix & freebpx
I have 3 SIP accounts and all working fine. I can dial out and in without problems.
Now i uploaded new “music on hold” audio files and configured the inbound trunk to play this audio files. But now i cant hear any system playback or MOH Audio if i call from outside. Both directions work well (user voice) but system sounds aren’t played.
If a make a local call the sounds are played and i can hear them.
In CLI I see the lines “Playing…” in both cases (from outside an a local call).
Can anyone tell me what i have misconfigured on my system?
I deleted the inbound routes and restored the settings in MOH.
thanks a lot