DMVPN Hub 3945 without ISM card

Does anyone have any experience with DMVPN hub running on a 3945 with no ISM card? Specifically wondering how many 881 model spokes it will support. The network makes heavy use of PIM-SM and is used primarily for voice and video. Assume throughput of 2M from each spoke.
thank you, E

I know this one is old, but what I don't see on your Firewall is AH and ESP, I only see GRE. Also are you trying to offload the IPSEC protection to this firewall?

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