@book{221142,
	author = {Porter, Thomas. and ebrary, Inc.},
	title = {Practical VoIP Security},
	publisher = {Syngress Publishing,},
	year = {c2006.},
	address = {Rockland, MA :},
	note = {Includes index.},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10115219}
}