Snom M55 Quick Installation Manual page 24

If registration fails:
The handset beeps and displays "Registration failed".
a. Press OK.
The handset displays "Device not registered to base station."
b. Make sure the handset is near the base station.
c. If your phone system is a multi-cell environment, make sure you
are registering to the Primary base station. Click Status in the
WebUI sidebar, and then click Base Status. See which base station
IP address is set to "Primary" mode. Open the WebUI for this IP
address.
d. Try to register again; go to step 3.
Deregistering the handset
Before using the handset with a different base station, you must deregister
the handset from the base station to which it is currently registered.
To deregister the handset:
1. Press the MENU/Confirm key.
2. Press and
3. Press or
4. Press
or
5. Press
or
The "Deregistration" screen appears, showing the list of
registered handsets. Your handset is indicated by ÛÛ.
6. Press
or
deregister,
and press Sel.
7. Enter the PIN and press OK. The default PIN is 0000.
The handset beeps and displays "Handset is deregistered".
To deregister the handset using the WebUI:
1. Using the base station's IP address, open the base station's WebUI in a
web browser.
NOTE: If your phone system is a multi-cell environment, you must open
the Primary base station's WebUI. Click Status in the WebUI sidebar,
and then click Base Status. See which base station IP address is set to
"Primary" mode. Open the WebUI for this IP address.
to select (Settings), then press OK.
to scroll to User settings, and press Enter.
to scroll to Registration, and press Enter.
to scroll to Deregistration, and press Sel.
to select the handset you want to
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