You have purchased Snom second hand desk phones or have changed your PBX provider and when you start these phones they are configured on an old PBX?
You're trying to get into the web interface and if it works you notice that important functions are grayed out and can't be changed?
Background knowledge:
If a Snom phone is configured on a PBX, this is done with the unique MAC address and allows the PBX to identify the phone at any time. In addition, a set of information is given to the phone on this occasion, which causes the phone to ask the same PBX every time it is restarted if anything has changed.
If the phone does not find its PBX at startup, it first tries to reach the Snom Redirection Server (SRAPS). PBX partners have the possibility to register the phones managed by themselves in SRAPS and to configure a link to your PBX. This is mainly done by providers of cloud PBX systems.
Please note that your Snom phone can also get a provisioning server using the DHCP option when you boot the phone. So always check your DHCP configuration if you have any of the above problems with your Snom phone.