Snom VoIP Phone - Manual (Page 45)

Call Register
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In addition, any number can be added to the deny list by selecting
<new item> in the deny list of the phone directly.
After the number has been entered, it is added to the deny list.
Or add a new deny list entry on the “Address Book” webpage and mark
it “deny”.
Pressing
on an incoming call will only deny that particular call and
will not put the caller on the Deny List.
Removing a number
There are three ways to remove a number from the deny list: (1) Press
the “clear” key
on your phone while viewing the deny list. (2) On
the “Address Book” webpage click onto the small red crossed icon at the
end of the line you want to delete. (3) Change the contact type on the
“Address Book” webpage!