do you have a PRI on the remote location or do you only have POTS lines ?
if you only have pots lines
I'd say you can configure a trunk group on the fxo where you have pots lines connected to
then create a generic dial peer something like
dial-peer voice 9 pots
destination-pattern 9T
trunkgroup FXO
if you want to be more specific to avoid interdigit time outs you can create 1 dial-peer for local, long distance and emergency services
if you have a local PRI on H.323 you shouldn't have any problems
if you have a local PRI with MGCP just make sure that you have the failover stuff configured so mgcp will release the D channel and then the local gateway will take control of it