I had a problem with the fonts while running a UI client on ITC. On my test panel the fonts and the font size where changed after running it on the ITC. Does that mean that if ITC doesn't support that specific font, it changes it automatically to it's default font? I couldn't find any information in the documentation of the ITC and WinccOA. Any information would be of great help.
This is why we switched to Google Noto Sans as main font as it is available on every platform.
You need to consider the target platform when choosing fonts and make sure it is available there.