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Well, when you audit VoIP, you need to have the basics covered. What is the transport critera for VoIP, and does your network comply with that? Measure the amount of existing voice traffic and determine VoIP bandwidth usage for starters. Then I would look at transit delays, jitter and packet loss ratio to get a handle on how well your network is performing. Using that information, you should be able to form a pretty clear picture of how well VoIP will work on your existing network, and if it is not satisfactory, you can start looking at your network design and determine the architecture that needs to be implemented.