Observation

The softphone lines cannot be registered.

The status remains at "yellow" with the overfly info "WebService/Audio Relay Service: The service is currently unavailable."

Example screenshot: Microsoft Windows Resource and Performance Monitor

Procedure

kurento.conf.json available?

Check if the .\Program Files\estos\UCServer\MediaService\emswindows\etc\kurento\kurento.conf.json file is available. 
If the file is not available, please perform a repair installation or contact estos support.

Port 8888 occupied by other process?

Check whether port 8888 is used by a process other than uc-media-server.exe Microsoft Windows Resource and Performance Monitor can be used for this purpose: Resource Monitor → Monitoring Ports.

Port 8888 may only be occupied by the process uc-media-server.exe.

Performance Monitoring for ProCall Enterprise UCServer