You will need to set up a NAT pool.
Example:
192.168.1.xxx (inside network) --> rvs4000 --> internet --> 129.200.99.xxx
At the rvs4000 hop, the device will need to do NAT translation from a set of static NAT entries or a NAT Pool/PAT. This means it changes 192.168.1.xxx into some address on the outside interface of your device, making it internet routable.
RFC1918 includes 192.168.0.0/16 as non-routable ip address space.
Hope that helps.