@article{407171,
      author = {Johnston, Alan B. and Piscitello, David M.},
      url = {http://library.usi.edu/record/407171},
      title = {Understanding Voice over IP security [electronic resource]  /},
      publisher = {Artech House,},
      recid = {407171},
      pages = {xvii, 261 p. :},
      address = {Boston, MA :},
      year = {2006},
}