Snom ONE IP Technical Manual page 106

Deploying the snom ONE IP Telephone System
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The permission to manage the domain should be given only to those who are allowed to
change passwords, create or delete accounts, change dial plans and rates, and so forth.
Permission is given from the Permission tab in the user's extension account:
To log in to the domain, users will need to log in as Domain Administrator (with their
extension credentials) as shown below:
Once logged in, domain administrators will be able to access the domain settings
shown below.