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The line tester now prompts for an ID + Pin before it will go any further.
Our older-style SALT tester doesn't do anything but drop you straight into the test (i.e. reads back the number then says "Start test," which is the cue to hang up).

The newer test facility is completely open as far as getting CLI (which includes the leading zero) and basic ringback is concerned. If you go into the line test section though, you're now prompted with "Press 1 if you have been authorized to use this service, or hang up." No security code is needed, and in fact even if you don't press 1 it still drops you straight into the test menu a few seconds later anyway!