Yes, you can. You must configure a voip dial-peer and a pots dial-peer with great value of "preference" to remote UC.
This is an example:
dial-peer voice 100 voip
preference 1
destination-pattern REMOTE UC NUMBER
session protocol sipv2
session target ipv4:REMOTE UC IP
... omitted ...
dial-peer voice 101 pots
description POTS_backup
preference 2
destination-pattern REMOTE UC NUMBER
port 2/1
... omitted ...
Commands "preference", "hunt stop", "voice hunt" handle the hunt process on different dial-peers.
Regards.