I am not sure whether your system is different from our system, I doubt it. In Norway toll free numbers are linked to a number of "normal" numbers by the telephone companies. The link automatically goes to the nearest physical unit, so that people with local knowledge will answer.

>Hi everybody,
>
>I did a quick research and found this link https://www.fcc.gov/consumers/guides/what-toll-free-number-and-how-does-it-work
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>What I want to understand and wondering if any of you may know the answer (supporting document) if these numbers were always the numbers above, if they can ever change (new area codes added or removed), etc.
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>Do you know if and where I can get the answers on the above questions? To me it looks like the numbers were always the same and will remain the same, but I'd like to be sure.
>
>Thanks in advance.