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How do I secure hosts in a GPRS based SCADA network?

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arkahnz
How do I secure hosts in a GPRS based SCADA network?

I work on a SCADA system that basically uses a GPRS network to acquire data from remote sites. The 3rd party telecom company providing GPRS allots dynamic IP addresses to the remote devices. We use a cisco router at the perimeter for managing incoming traffic from these remote sites. In such a scenario where IP addresses change over time, how do I secure my SCADA hosts at the control center? I basically want to make sure that only the traffic coming from the remote sites is allowed into the LAN network of the control center.
Thanks
Khaled