Route through site-to-site VPN not working

I'm trying to set up a site-to-site VPN using RRAS on two 2K8r2 servers since yesterday. The connection is working at this point, but I can't get it to send traffic from one site to the other one.

Set up: the set up is the same on both sites: the server is connected to a router that's connected to a modem. The routers act like a DHCP-server and assign IP addresses from the range subnet.21-subnet-.100. Both servers use a static IP address, subnet.11, and are set up as DMZ.

Configuration: the servers are configured using the wizard to set up a site-to-site connection. This works with a demand-dial interface and a PPTP VPN connection. As mentioned, the VPN connection work properly.

Problem: I can't get the servers to send the traffic for the other site, to be sent through the VPN connection. I added a static route on both server (home, office 1) and I can see the result in the IP routing table (home, office 1). I did this because the route didn't show up automatically. My guess is that this last step isn't right, for example because the routing table states "non demand-dial", which seems not correct.

Home:

• Subnet: 10.0.1.0/24
• Router: 10.0.1.1
• Server: 10.0.1.11 (DMZ)
• DHCP: 10.0.1.21-10.0.1.100
• RRAS DHCP: 10.0.1.101-10.0.1.150

Office 1:

• Subnet: 10.0.2.0/24
• Router: 10.0.2.1
• Server: 10.0.2.11 (DMZ)
• DHCP: 10.0.2.21-10.0.2.100
• RRAS DHCP: 10.0.2.101-10.0.2.150

I hope someone has an idea to get this route working!