Grandstream Networks UCM630 Series User Manual page 207

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Note:
Users could also add a number to the Blacklist or remove a number from the Blacklist by dialing the feature code
for "Blacklist Add' (default: *40) and "Blacklist Remove" (default: *41) from an extension. The feature code can
be configured under Web GUICall FeaturesFeature Codes.
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UCM630X Series User Manual
Version 1.0.2.25