General Feature Barring provides a mechanism for preceding features to bar a call on behalf of the terminating user. It takes precedence over ODB and MMTelICB .
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What is General Feature Barring
General Feature Barring is an enhancement to Incoming Call Barring, to enable other features to trigger barring.
General Feature barring uses the
BarIncomingCall session state field to signal that another feature wishes a call to be barred.
True then the call will be barred.
General Feature Barring takes precedence over ODB and ICB rules.