> 4.2.2.2 how would you read that over the phone, in german?

Vier punkt zwei punkt zwei punkt zwei.

But the TTS isn't me, it sees 4. 2. 2. 2. (with spaces in between) and reads Vierte, Zweite, Zweite, Zweite (fourth, second, second, second).

Without spaces, it reads it like the way Germans read an IP address (see first line of reply).

In German the "." after the number is like the "nd" or "th" in "2nd" or "4th".