Are you sure, Storm? I thought it depended on the T/A and if it had RJ-11's.... They use them for fax, standard phones, etc., but it would still seem to me kind of silly...
Conversions: digital PC, analog modem, digital ISDN, digital WWW "cloud", back digital ISDN, analog modem, digital PC... Seems like something would get lost there!
NOT speaking from experience, but in a similar boat - dial in to work & ISP on modem, but would like ISDN for ISP, but work still has to be modem....