Re: simple point to point 1841 to 1841 through a T1
remote site router should have statement:
ip route 0.0.0.0 0.0.0.0 10.10.52.1
corp:
ip route 192.168.200.0 255.255.255.0(or your actual mask) 10.10.52.2
make sure the other devices on 131.107.1.5 have the correct default gateway or the default gateway they point to has correct routing for the rest of the network.