1. SIP: session initiation protocol;Rosenberg;IETF, RFC,2002
2. Requirements for management of overload in the session initiation protocol;Rosenberg;IETF RFC,2008
3. Design considerations for session intiation protocol (SIP) overload control;Hilt;IETF RFC,2011
4. Evaluating SIP server performance;Nahum,2007
5. On TCP-based SIP server overload control;Shen,2010