To improve security between a main and remote site a new firewall was installed between them. Users now complain of the following symptom: Users can dial between sites, the remote phone rings and when the phone is answered the line is dead, no voice can be heard. Which of the following is the MOST likely cause of this issue?

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To improve security between a main and remote site a new firewall was installed between them. Users now complain of the following symptom: Users can dial between sites, the remote phone rings and when the phone is answered the line is dead, no voice can be heard. Which of the following is the MOST likely cause of this issue?