1. Australian Government – Office of the Privacy Commissioner: Privacy Impact Assessment Guide. Australian Government (2010),
http://www.privacy.gov.au/materials/types/download/9509/6590
2. Gartner Inc.: Gartner Magic Quadrant for Unified Communications 2010. Gartner Inc. (2010),
http://msunified.net/2010/08/09/gartner-magic-quadrant-for-unified-communications-2010/
3. Nissenbaum, H.: Privacy as contextual integrity. Washington Law Review 79(1), 101–139 (2004)
4. Hofbauer, S., Quirchmayr, G., Wills, C.C.: CDRAS: An approach to dealing with Man-in-the-Middle attacks in the context of Voice over IP. In: International Conference on Availability, Reliability and Security, ARES 2011, pp. 353–358 (August 2011)
5. Cisco Systems Inc.: Cisco Call Detail Records Field Descriptions. Cisco Systems Inc. (2010),
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/8_5_1/cdrdef/cdrfdes.html