able to access the webpage by default.
First, verify if the phone's current firmware is an MPP version. You can check this in the phone's settings under device information. If it's not MPP, you'll need to convert the phone to MPP, which involves a licensing cost.
Alternatively, if it's not MPP, you can request the supplier to provide an MPP flavor version instead of the Enterprise one.
Note: Enterprise version phones are designed to work with Cisco call control platforms like CUCM and CME.