Telnet to the router at Site B. Once in the site B router, type the following:

service-module service-engine x/x session

(You can do show ip interface brief to get the slot the CUE is in and replace the x/x accordingly)

or if you have a newer CUE model, type

service-module integrated-service-engine x/x session

That should get you in.

Hope that helped, if so please rate.