UCCX 7.01 CTI manager failover

Hi, I couldn't find any definitive documentation on the what determines if a CCX server fails over to the secondary CTI manager. Is it loss of ping? Is it CTI service related.
Env:
2 CCM servers running 7.0.2
1 CCX server running 7.0.1
Our CCX server is pointed to the subscriber first and publisher second under AXL provider and CTI manager. Replication between the 2 servers failed on Jan 2nd. When folks tried to log into CCX on the morning of Jan 3rd, they received an error stating that a CTI manager is not available. We logged into CCX and removed the subscriber from the list of selected AXL and CTIM servers and people were able to log into CCX. We rebooted the subscriber and after some time, replication was again restored.
My main concern was why did the CTI Manager running on the publisher not take over? Was it because the Subscriber was still pingable? The TAC engineer stated that the failover was based on pings. Can anyone verify this? He did not seem too confident when he made this statement and it would make much more sense to have the failover based on service availability.
We've since gone into RTMT and setup e-mail alerts so in the future, we'll at least be given a heads up if there is a replication failure.
Thanks in advance!
-Eric

This is what I found but it does not seem to contain any useable information.
503: Nov 11 15:19:46.829 EST %MIVR-CLUSTER_MGR-7-UNK:Post Convergence Event: CONVERGENCE_COMPLETED, name=CRS SQL Server - Repository
504: Nov 11 15:19:46.844 EST %MIVR-PROMPT_MGR-1-MGR_PARTIAL_SERVICE:Prompt Manager in partial service:
505: Nov 11 15:19:46.844 EST %MIVR-GRAMMAR_MGR-6-MGR_IN_SERVICE:Grammar Manager in service:
506: Nov 11 15:19:46.844 EST %MIVR-CLUSTER_MGR-7-UNK:try to process MasterConvergenceCompletedCmdImpl: name CRS SQL Server - Historical, nodeId=1, type=MASTER_ELECTED, uniqueId=99, master=true, updateTick=423, baseTick=422, nodeCurrentTick=423
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