Have you enabled frame-relay switching on one of the routers?
Becasue in back to back scenarios, since you are not using the frame-relay switch, one of the routers should be specified as the frame-relay switching by giving frame-relay switching global configuration command.
Also the frame-relay dlci numbers should be the same when you are connected back to back. So please check weather you have the same dlci on both rotuers.
Using frame relay with two routers you are only going to get layer2 communication, frame relay lmi between those two routers. However, if one router has 3 interfaces you could make it the frame switch on two ports, connect one to the other router and the other to the third port on the router that is also the switch. Now you can set up route maps between the port on the switch router that is not switched and the external router.
Otherwise you need three routers do simulate frame relay.
You can use your back to back connection by turning off frame relay.
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