Experience with Netgear FVS to CISCO ISR VPNs?

We are trying to get 20 or so remote offices to connect to a new CISCO

2811 at a central colocation site. All of these sites have Netgear FVS318 routers that currently have a couple VPNs up and running efficiently. When I take a CISCO 870 router and create a VPN connection to the 2811 all is fine. However, if I take one of the Netgears at the same site, same settings it will not connect. I have performed incremental firmware flash on the Netgear and their support seems to be stumped at this point. Has anyone else had a similiar setup? Any ideas or hints before we are forced to purchase hardware to fix the problem? Thanks in advance.
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