VPN through NAT

Hi all,

I do need a solution to create VPN between 70 remote sites and a central site, all equiped with Cisco IOS routers. On the way from the remote sites to the central site, a NAT does change remote sites IP addresses to a unique IP. As far as I know, the NAT then makes impossible to use PSKEY to match key with the remote IP address, as all remote sites are seen as the same IP address from central site.

Thanks and regards