Hitachi TD61-2472 - Manual (Page 40)

1.10.2 User Registration
Registering a user.
1 To register a user, either press the "2" on the number pad or select "2.
Register user", then press the
key.
2 Use the number pad and the LeftSoft key to enter the user's telephone
number.
If you try to input an Alias that is already registered, the "Already
registered" message is displayed and the display returns to the input field.
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