I'M HAVING TROUBLE WITH MY FAX, SOMETIMES IT GIVES ME "PHONE LINE IS BUSY" "ERROR LINE DISCONNECTED" AND WHY DOES MY COPIER COME ON WHEN I PICK UP MY PHONE. DO I HAVE TO DISABLE "CALL WAITING" EVERYTIME I USE THE FAX. AND HOW DO I DO THAT. HOW DO YOU SCAN ON MY X5650, THE USER GUIDE IT COMES WITH IS TERRIBLE. AND CAN I BUY MY INK CARTRIDGES ANYWHERE OR DO I HAVE TO BUY THRU LEXMARK.