1. Shen C, Nahum E, Schulzrinne H, Wright C (2010) The impact of TLS on SIP server performance, in Principles, Systems and Applications of IP Telecommunications (IPTComm '10), New York, NY, USA, pp. 59–70
2. Zourzouvillys T, Rescorla E An Introduction to Standards-Based VoIP: SIP, RTP, and Friends, in IEEE Internet Computing, vol. 14, no. 2, pp. 69–73
3. Rivest R (1992) April. The MD5 Message-Digest Algorithm. RFC 1321
4. Schulzrinne H, Casner S, Frederick R, Jacobson V (2003) July. RTP: A Transport Protocol for Real-Time Applications. RFC 3550
5. Paul S (1998) Real-Time Transport Protocol (RTP), in Multicasting on the Internet and its Applications. Springer, Boston, MA, pp 193–201