The total cost of ownership or TCO separates one vendor of VoIP to another. An enterprise has telecom expenses as one of its biggest expenses. But, it is found that many companies fail to account for factors causing cost fluctuations, such as increasing data costs and high operational costs associated with employee-owned phones. Organizations must figure out the TCO for your VoIP solution. They are: CAPEX costs, OPEX costs, subscription costs, support costs, maintenance costs, ongoing training costs & network costs. Read more at: http://it.toolbox.com/blogs/voip-news/what-is-your-tco-for-your-voip-solution-70097