Haven't looked at your first thread, but had a similar problem with drivers for a friend's old PC which had run from the beginning in 95.
Trouble was they had a new USB only - printer.
That was relatively a meccano type adition with an upgrade to 98.
The modem was quite a different matter and I eventually found a friendly driver which worked by choosing a look-alike from Windows own collection of "56K" modems.
There was of course no Bitware or Supervoice but that doesn't worry this couple who use it sparingly for internet info, and typing letters!
My point is that you now have 3 variables to match
The Modem, the OS and the telephonic and Fax stuff.
The OS is obsolete and you may have better luck begging or researching for an OLD version of Bitware or even Supervoice. Then again why not try to install just the modem from generic drivers - for a start.
I think the problem could well be solved by someone on this forum who understands the command strings and can dictate what should show when you access those.
It is sad to see your post disappearing without a response so if nothing else, this will have bumped it up.