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Please verify the following steps to register.
1 Base unit: Press (FUNCTION).2 Select “Registration” by pressing <or> , and press H.3 Select “HS registration” by pressing <or> , and press H.4 Cordless handset: Press (FUNCTION).5 Select “Registration” by pressing <or> , and press H.6 Press H to select “HS registration”
If you have set PIN at any point in the past, you will have to enter that PIN after step 6
At the end of all that, wait for a beep and for both the handset and base toto display the registration number, then press exit.