Data between a client and a server is pinned through a receiving interworking unit and a transmitting interworking unit connected via a non-IP based communications path. The receiving interworking unit and transmitting interworking unit convert received data between IP and a non-IP based communications protocols. The transmitting interworking unit receives IP data for the client from the server. The data is converted and transmitted via the non-IP based communications link to the receiving interworking unit, which converts the data back into an IP format and forwards the converted data on to the client. One segment of the path between server and client transports the data in a non-IP format. Neither IP client nor the server are aware of the non IP segment and no change in their IP network mode of operation is required.