Siemens HIPATH 8000 - Manual (Page 244)

Step by Step
Individual phone configuration
244
Initiating the reset
v
Press the key shown until the "Settings" tab is active.
Confirm the option shown.
if nec.
j
Enter and confirm the user password.
Select and confirm the option shown.
Select and confirm "Reset selected user data" in the
context menu. The user data is reset to factory settings.
User
Reset
All user data...