Configuring Frame Relay using a Switch Simulation - Packet Tracer
Solution 1:
Do you have the routes to each other router?
I don't know if it is necessary to add the routes to your frame-relay configuration, but you should check like this:
RTR_EDGE# show ip route 172.20.1.109
RTR_EDGE# show ip route 172.20.1.113
RTR_ENG# show ip route 172.20.1.117
RTR_SAL# show ip route 172.20.1.117
Solution 2:
Your endpoints are on a different subnet to each other, if you decrease the subnet mask to a /27 (255.255.255.224 in non-CIDR terms) you should have more luck.