A user traveling overseas is in a place where there is access to WiFi. The user can receive email and talk using VoIP, but cannot place or receive phone calls. Which of the following is the MOST likely cause of this issue?

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A user traveling overseas is in a place where there is access to WiFi. The user can receive email and talk using VoIP, but cannot place or receive phone calls. Which of the following is the MOST likely cause of this issue?