We are opening a new office. The office will only have 2 people there. We need to have 2 lines plus a fax line coming into the office. We would like for the office to be able to have a main # with the 2nd # being a roll over #. We will also have a 10mb internet connection from Century Link. Any suggestion on the cheapest way to have the office phones share the 2 incoming phone lines? From talking with Century Link we would have to have a key system in place for this. Any suggestions on a cheap key system for just 2 phones?