Siemens Hicom 150 E - Manual (Page 39)

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The default settings are described on page 27. The mobile telephone
features are handled as follows when resetting the defaults:
Selecting a base
If your mobile telephone is registered at multiple bases, then you can
set a specific base or the base with the best reception as the base to
be used. The mobile telephone then switches automatically to this
base.
Please proceed as shown in the overview on page 26 to select the
base. The selected base is ticked.
Feature Reset
Telephone directory retained
Redial list deleted
System registration retained
Select Base