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If your VPN/firewall preserves LAN-to-LAN connectivity between the two locations and routing is correct then it would be the same as any other SIP trunking situation. Can you ping across the VPN link between the 7100 and the pbxinaflash? Do you see any SIP traversing the link in debugs?
It would be useful for us to have more specifics as to the nature of the failure such as no connectivity at all, SIP errors, audio issues, dialplan, etc. as well as what you have tried and ruled out.
Thanks jayh for the "ping question". That got me to thinking about the simplest part of the setup and made me realize that my 7100 has a Voice Vlan that is not included in the VPN. I created a second VPN with the Voice Vlan and I can now ping across the VPN. I logged in to my 7100 and started a sip debug to submit here. Surprisingly when I dialed the remote extension I heard it ring and they answered on the other end! I had them call me using my extension and it works both ways. I guess my configuration was fine but routing was the problem. Thank you again for the kick start.