This brings back memories of being a clueless script kid in the 1990s.
I knew those tones as CCITT5 tones.
In the days of blueboxing I had a 486 laptop that I acquired because the harddrive died and booted from floppys, a DOS program called 'The Little Operator' that played tones and a photocopy of a book about telephone switching.
I knew those tones as CCITT5 tones.
In the days of blueboxing I had a 486 laptop that I acquired because the harddrive died and booted from floppys, a DOS program called 'The Little Operator' that played tones and a photocopy of a book about telephone switching.