Is it possible to add USB modem?

[hayamar_x]

I'm not saying there is any benefit to adding this feature. However, if you want to create an environment where all software can operate properly, I would like you to be able to use a telephone line with a USB connection. (The so-called dial-up connection is only used for this game, but you must use a modem connected via USB, not a PlayStation BB.)
The name of the game is "Easy Browser", SLPM62068. You can find out more about this feature by visiting the website below.
https://ascii.jp/elem/000/000/319/319756/

[hayamar_x]

https://ascii.jp/elem/000/000/322/322806/
This link is also referring to