I made 56874 calls to explore the telephone network. Here's what I found

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I made 56874 calls to explore the telephone network. Here’s what I found. What kind of systems are there in the Finnish telephone network today?
This question appeared to me a while ago when leafing through an old telephone directory from the early 2000s.
There are at least ordinary subscribers, business customer support lines, voice mails, and fax machines. Subscribers and customer support lines are not of special interest to me.

Article Link: I made 56874 calls to explore the telephone network. Here's what I found