Read-create option (allow(1) default, or discard(2)) for how to treat service traffic while waiting for a Credit Control Answer, in the scenario where the validity timer has expired. Note: this object's own real DESCRIPTION describes the validity-timer-expiry scenario rather than a literal 'threshold' event as its name might suggest; the explanation follows the actual shipped text, which is the authoritative source. Lets an operator choose whether subscriber traffic is allowed to continue or is blocked while awaiting the OCS's response after a validity-timer expiry.