The nbn access network will replace most of the existing landline phone and internet networks. It also involves new technologies, which some existing devices may not be compatible with. That means if you have a medical alarm, its important that you register it with nbn and contact the device provider to check if the device will work on the nbn access network or what alternatives may be available. Make sure you do this well before your existing landline phone network is disconnected. Registering the alarm is free and helps nbn to identify homes where support may be needed to help minimise a break in services when the existing network is switched off. For further information please go to the nbn website