1. Camarillo, G., Gracia-Martin, M.A.: The 3G IP Multimedia Subsystem (IMS), 2nd edn. Wiley, Chichester (2006)
2. 3GPP TS 23.228, IP Multimedia Subsystem (IMS), v.6.5.0 (June 2006)
3. Case, J.: A Simple Network Management Protocol (SNMP), IETF RFC 1157 (May 1990)
4. Rosenberg, J., et al.: SIP: Session Initiation Protocol, IETF RFC 3261 (June 2002)
5. 3GPP, IP Multimedia (IM) Subsystem Cx and Dx Interfaces; Signaling flows and message contents. TS 29.228, 3rd Generation Partnership Project (3GPP) (June 2005)