Hey Dusan,
Long time no chat.
The issue is that you can't have an unbreakable modem under Linux because you can't have an unbreakable modem, because you can't have an unbreakable phone line.
What if someone digs up your phone lines?
What if the line just drops out, which even with the most reliable modems will happen once every few days?
Having said that, Linux will work fine with any of the hardware modems you mentioned. Get used to replacing the modems every few years as they burn out from constant use, and perhaps consider rack modems which are more reliable but cost a lot more.
-- Del
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