The Brother MFC-7420 fax machine is just the same as an analogue telephone like you would have at home. This means that it will connect to a standard BT telephone line or any other analogue line you may have.
Also if you want to connect the Brother MFC-7420 into a telephone system it will connect as long as it is to an analogue extension. It will not work on an extension designed for a specific type of system telephone.
Brother Fax Consumable
As the Brother MFC-7420 is a laser fax machine it needs a toner and a drum as consumables. Theses are as follows:
Brother Toner TN2000 – Up to 2500 Pages
Brother Drum DR2000 – Approx 12000 Pages
Please contact our customer service team if you require any further help or advice.