When a user tries to dial an international number the call fails to dial out of the phone system. The technician dials from another phone on the same phone system and is able to complete an international call. Which of the following is the MOST likely cause?

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When a user tries to dial an international number the call fails to dial out of the phone system. The technician dials from another phone on the same phone system and is able to complete an international call. Which of the following is the MOST likely cause?






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