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This topic assumes that user A with the lowest service rights is having an incoming or outgoing call. If the trunk resources are full, user B with higher service rights can preempt the trunk resource occupied by user A to make an outgoing call. Then, user A will hear the announcement "The system is busy. Please try later." Figure 1 shows the scenario.
Figure 1 Trunk preemption by user rights level
Parent Topic: Trunk Preemption by User Rights Level