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.