A distributor that has an early version of VoIP and IP-PBX discovered that they had lost all voice services during a worm/virus attack on its IP network. Which of the following steps might this distributor take to avoid such an outage in the future?

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A distributor that has an early version of VoIP and IP-PBX discovered that they had lost all voice services during a worm/virus attack on its IP network. Which of the following steps might this distributor take to avoid such an outage in the future?