Hello Daniel,
PCAnywhere uses TCP port 5631 and UDP port 5632, so the NAT mappings on the router would look like this (assuming your server address is 10.10.10.10):
ip nat inside source static tcp 10.10.10.10 5631 interface Serial0 5631
ip nat inside source static udp 10.10.10.10 5632 interface Serial0 5632
If you want to translate the server address to a specific IP address, you would use:
ip nat inside source static tcp 10.10.10.10 5631 172.16.1.1 5631
ip nat inside source static udp 10.10.10.10 5632 172.16.1.1 5632
where 172.16.1.1 is the address your server's address is being translated to...
This is, as far as I remember, the way it should work. If you have trouble with this, let me know...
Regards,
GP