Pleased to hear you got the solution working.   Regarding data in logs, the default situation is that sensitive data is not logged.  However, turning on advanced tracing will include collected digit strings just as turning on debug tracing on the gat...

This will do the job provided you're willing to have the outgoing call leg transit a CUBE.https://twitter.com/tindallpaul/status/1284194828071440386  

Suggest you check out the Cisco Live session archives for San Diego 2019 session BRKCCT-2010 covering ECE integration.  That session included material on server-side integration using both the JS library and the preferred approach using the 12.0 mess...

That is progress and clearly explains your original app not found error.  From this latest error on loading it suggests that your survivability.tcl file on the CUBE is not a TCL file.   Can you confirm that the survivability.zip you uploaded contains...

If you're getting an application not found error then it hasn't been loaded successfully.  Make sure you do "call appl voice load cvp-survivability" and have "deb voip appl tcl" turned on when you do it so you can see any errors.