Move a contact to the blacklist via web interface:
1) Click Contacts option to enter the configuration page.
2) Choose a record and click the Group Name option, then choose Black List in the
pull-down menu.
3) Click the Save button to save your changes.
Delete Contact
Delete a contact record via phone interface:
1) Click Directory -> Options , then use the Up/Down navigation keys to choose
a record you want to delete.
2) Click Delete option to pop up the dialog reminding “Delete XX?”.