Using a FreePBX server with a PRI card to feed an existing PBX

Does anyone know if it is possible to place a FreePBX server with a PRI card in front of an existing PBX. The idea is to have calls come in to the FreePBX server Via SIP trunk then route to a PRI card which would feed the existing PBX.
Before I get more details I just wanted to know if it is possible.

Yes, PRI’s can be configured as network or CPE signalling.

Yes its possible and well documented “out there”