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Richard - The CS5119 is expandable up to five cordless handsets. The expansion handset compatible to the unit is the model CS5109. Additional handset/s have to be registered to the main telephone base for you to get a dial tone. Simply place the unregistered handset in the main telephone base (bigger charger) to register. Registration process will take about 60 seconds. When the registration process completes, the handset display shows Registered and you will hear a beep. Hope this helps!
Sorry, there was a problem. Please try again later.By "Registering" it means you just need to put the new handset into the ORIGINAL PRIMARY cradle and let the new handset sinc with the system. Piece of cake!
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