[MovedGoalPosts]

You can install it as an extension to your single phone line, but most faxes will then try to answer every call. Some however are clever enough to be able to see if it's a fax or voice call, or alternatively you get a filter. I suppose it depends on how many faxes you might receive and if that would be when you are out. Many people just leave the fax off until they know a call is coming in.