Cisco VPN Client and statically assigned IP Address

Hello there,

i have several PCs connecting to a central site router using the VPN Client (5.0.01.0600) and different media (DSL, ISDN, UMTS).

I would like the central router to assign the same IP address to the VPN clients each time they connect again to the central site.

So far I have an IP pool configured on the central site router, but this assigns a different address each time a client connects.

Thank=B4s for any suggestion.

Mathias