• VOZŇÁK, M.: Architectures, Protocols and Services for IP Telephony for joint teaching programme of BUT and VSB-TUO. VŠB-TU Ostrava, 2014, 358 p., 978-80-248-3640-9.
• COLLIER,M.,ENDLER,D. Hacking Exposed Unified Communications & VoIP Security Secrets & Solutions, New York: McGraww-Hill, 560p. 2013.