Guess more or less self explanatory. Where does the CFD MyCall.Info (...) directive log ? Does it need a specific logging level ? Is there a reference guide for CFD ?
It logs to the 3CXCallFlow.log file. You need to ensure that the server activity log has the logging level set to Medium at least to get it to the file.
Yes, you can download if from the 3CX Console > Admin > Dashboard > Troubleshooting > Support Info. This will download a ZIP file, and you will find the log inside that file.