Topcom 900 PIN 1234 H5?

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Register/de-register a handset
9.2 Removing a handset from a Topcom Butler 900 base
You can remove a handset from a base to allow another handset to be registered.
The following will appear on the display:
4Enter the number of the base unit (1-4) you would like to subscribe the
handset to.
The unit will start searching for the base and when found, it will ask to enter
the PIN code (4 digits):
5Enter the base PIN code (0000 by default). If the PIN is wrong, the handset
will restart the searching for the base.
When the handset is registered, it will show “HS” followed by the handset
number.
1Press and hold the right key for 3 seconds.
2Press and hold the mute key for 3 seconds.
3Enter the base PIN code (0000 by default). If the PIN is wrong, the handset
will go back to standby.
4Enter the number of the handset (1-4) you would like to remove.
If the removal is successfully, the handset will go back to standby. If not, it
will ask again to enter the handset number.
You can only remove existing handsets other then the one you are using.
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g h i j k l m n o
456
g h i j k l m n o
PIN
456
g h i j k l m n o
PIN 1234 H5?
456
g h i j k l m n o