That was back in the day HD. I know this a bit like apples and oranges BUT when we replaced our old voice switch for a new one I had to go to the factory with engineers and installers to do the acceptance tests for it.
When we installed it at my airfield there was a training plan ,practical demonstrations,hands on experience and a test before each operator ( ATCO and ATSA) was signed off.
SRG then came and "quality controlled" the whole thing BEFORE it was allowed to go live.
I tried...but the quick shufty option wasn't available to us.
Rather like the "eg" .....a thing of yesteryear (at my former airfield anyway)