Evaluation of Quality and Security of a VoIP Network based on Asterisk and OpenVPN. - Dherik Barison; Rodrigo Sanches Miani; Leonardo de Souza Mendes (SECRYPT, 2009)

Evaluation of quality in encrypted VoIP calls. - Dherik Barison; Rodrigo Sanches Miani; Bruno Bogaz Zarpelão; Gean Davis Breda; Leonardo de Souza Mendes (CASoN, 2012)