How to make VPN (PPTP) Between DSR 500 and DIR 620 in both directions?

Question

Network administration

Raised a tunnel between two routers DSR 500 (server 192.168.0.0 network) and DIR 620 (client 192.168.10.0 network) question the tunnel works only in one direction from the client network, you can freely walk on the server network, but on the contrary, help to configure it from the server network had access to the client's network. (Now everything is connected via a PPTP server and a client. The client has a PPTP client connection and routing to the server network.)