The main base is the central communication for all the handsets, if your main base station is faulty none of your handsets will work.
BT3570 BT 3570 Cordless Phone with Answer Machine & Nuisance Call Blocker
BT 3570 Cordless Phone Additional Expansion Handset 086910 086911 086912
BT 3570 Cordless Phone with Answer Machine & Nuisance Call Blocker
BT 3570 Cordless Phone Cradle Charging Base Charger 086909 086910 086911 086912
BT 3570 Cordless Phone Cradle Charging Main Base Charger Cord 086909 NO HANDSET
