directmedia setup

Good Morning,

how can we configure directmedia on the pbx?

we have a remote office, where exist some remote snom300 and a patton smartnode.
we need to do not redirect voice traffic inside the MPLS connection from the remote office to the main office on the PBX.

how can we do that?
we read something about directmedia setup.
how can we check if it works good the directmedia setup?

Best Regards
Giuliano