A 50 user retail store has a VoIP system. During a worm attack on their network, the voice service became unavailable, although the VoIP administrator made sure that the latest patches were installed on the IP-PBX. Which of the following measures might help prevent such an outage in the future?

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A 50 user retail store has a VoIP system. During a worm attack on their network, the voice service became unavailable, although the VoIP administrator made sure that the latest patches were installed on the IP-PBX. Which of the following measures might help prevent such an outage in the future?