1. Kurtansky, P., Hasan, Stiller, B., Cuevas, A.: Extensions of AAA for Future IP Networks. WCNC 2004, pp. 1516–1521, IEEE Communications Society, March 2004
2. 3GPP TS 23.228: IP Multimedia Subsystem (IMS); Stage 2. Release 7, March 2007
3. 3GPP2 S.R0058: IP Multimedia Domain—System Requirements. Version 1, April 2003
4. TISPAN TR 180 001: NGN Release 1 definition. March 2006
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