Grandstream Networks UCM6510 - Page 272

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UCM6510 IP PBX User Manual
Version 1.0.20.31
Black/White List.
 If the user selects “Blacklist Enable” and adds extension in the list, the extensions in the list will not
be allowed to be reached via IVR.
 If the user selects “Whitelist Enable” and adds extension in the list, only the extensions in the list
can be allowed to be reached via IVR.