The AES link was down on Main CM because it was registered to ESS CM.
list survivable-processor
SURVIVABLE PROCESSORS
Record Name/ Type Reg Act Translations Net
Number IP Address Updated Rgn
1 CA-HAW-XXXESS ESS S y y 22:01 7/13/2018 238
10.XXX.XXX.188
No V6 Entry
AE SERVICES CTI LINK STATUS
CTI Version Mnt AE Services Service Msgs Msgs
Link Busy Server State Sent Rcvd
16 no down 0 0
17 5 no XXX000AES01 established 2945 2945
18 5 no XXX000AES02 established 3173 3173
19 no down 0 0
AES links were registered on ESS server , post server interchange by customer