How can I set the phone to admin mode

On the D1xx, D3xx and D7xx series (and when using the "old" web interface on a D8xx)

To set the phone to "Admin mode":

Enter phone settings
Enter "Maintenance" and select "Security → Admin Mode → On".
On the prompt enter your administrator password, if you have set one, or the default password, which is "0000" (four zeros), and confirm.

If you are in user mode and you don't know the administrator password, you can perform a reset to factory defaults

Warning: All configuration changes get lost!

(Note: This will work only when the web user interface is not secured by a password)

Obtain your phone's IP address and currently used firmware version by pressing the Help/Info button
Open a web browser and choose the URL corresponding to your current firmware version:
http://phonesIpAdr/advanced_network.htm?reset=Reset
Copy the appropriate URL into the address line of your web browser and then change "phonesIPAdr" to your phone's actual IP address.
The phone reboots automatically

You can also reset lost administrator and HTTP password by doing a recovery via Network ( Note: This process combines firmware update and factory reset)

On the D8xx series

To access the new web interface you can set the credentials for two users, admin and users, using the below parameters

https://service.snom.com/display/wiki/webserver_admin_name

https://service.snom.com/display/wiki/webserver_admin_password

https://service.snom.com/display/wiki/webserver_user_name

https://service.snom.com/display/wiki/webserver_user_password

Note For Older Snom Phones

Since firmware version 8.7.3.7 on the snom 3xx series it is possible to reset the phone using the key pad by pressing the following key sequence: