#92. A router is connected to a PBX via a 4 wire E&M circuit. All calls to the trunk are failing and it is suspected that the PBX is not seeing the incoming calls on the trunk. To determine if this theory is true the PBX is configured to generate dialtone when it sees an incoming call. Which of the following should cause the PBX to generate dialtone?
ген. 0.035
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