The phone system is getting a dial tone from some analog trunks that are coming off of a multiplexer. Every time the trunks are terminated into the phone system, phantom calls are generated. Which of the following is the MOST likely cause of the problem?

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The phone system is getting a dial tone from some analog trunks that are coming off of a multiplexer. Every time the trunks are terminated into the phone system, phantom calls are generated. Which of the following is the MOST likely cause of the problem?