

Yep, undisputed. Except by religious zealots who resort to bad faith arguments when some of their cultist beliefs are not accepted as fact by non believers, but on those subjects, those people aren’t taken seriously by anyone except others from their cult, so yes, pretty much undisputed.
That’s good for office work, the constant ringing gets annoying and when sitting behind the desk, you’re going to see the display light up anyhow. But yes, those settings shouldn’t be used for a house phone, I wouldn’t be surprised if that telecom company uses the same standard install for small businesses and households.