have this configuration on ASR1002F router. Trying to setup IP Sla so that we can monitor the delay on WAN interfaces. Would like to send UDP-ECHO from one router to another across the WAN.   I need to send and receive on fixed port numbers. Keep getting socket errors.  any ideas on what i need to do?

no ip sla 5
ip sla 5
udp-echo <dest ip> 65000 source-port 65000 control disable

frequency 5

ip sla schedule 5 life forever start-time now
exit