US Robitics are hard to use in this app
Pick up a used Hayes Accura 33 or 56k v34 v90.
You can get them on E Bay for 10 bucks. These work great on tvs and kxtd systems.
Then try ATQ0s0=1&w0&y0. this puts modem in dumb mode, auto answer in 1 ring and saves in the w and y profiles. Remember to AT&F first.
If you find info on US Robitics modem set switches to not echo commands, auto answer,
and save profile, but you may still need an At command string.