Just to add my 2 cents. I used to get many fax calls until I went from VZ landline to their digital. None in the two years I was with them. Switched to Xfinity and no calls UNTIL I attempted to send a Fax day before yesterday and this morning @ 9:11, I got my first Fax call. Not sure how or why, but I will be calling Comcast to see if they have a solution. If not, my "Call Blocker" has room for 3K more numbers.