Deutsche Telekom T-Eumex 504PC SE - Manual (Page 69)

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Configuration via Telephone
You can deactivate or delete all activated features and activate all default settings
instead. This resets your system to the delivery state (i.e. the factory settings are active
again).
The secret PIN is reset to 0000.
Lift the handset. The configuration mode is active and you hear a special internal
dialling tone.
Select the code digits 900.
Press the hash key. After a moment you hear a positive acknowledgement tone.
Replace the handset.
Restoring the Default Settings
b
9 0 0
# q
d
Resetting the Communications System