Comcast does have an incompatible list for phones and fax available, just ask your dispatcher. Call Comcast dispatch directly if your contracting company doesn't have one. However; HP all-in-one printers are not on that list because 99% of the time, as ccavd stated, it is a polarity issue. I HATE hp all-in-one printers! Does anyone know if COX has an compatibility list?
This is CABL.com posting #191857. Tiny Link: cabl.co/mX4D