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Overflow Receiver
When the number of calls waiting in the calling group queue reaches the overflow threshold, calls can be sent to an overflow receiver, which can be another calling group or the QCC queue. Only one calling group or the QCC queue can be programmed to provide overflow coverage for the same calling group, and each calling group or the QCC queue can provide overflow coverage for more than one calling group. If no overflow receiver is programmed, the call continues to ring in the queue until it is answered or the caller hangs up