1. Finkelstein, M., Garrahan, J., Shrader, D., & Weber, G. (2000). The future of the intelligent network. IEEE Communications Magazine, 38(6), 100–106.
2. Knightson, K., Morita, N., & Towle, T. (2005). NGN architecture: generic principles, functional architecture, and implementation. IEEE Communications Magazine, 43(10), 49–56.
3. 3GPP, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS) State 2 (Release 5), TS 23.228, Jun. 2003.
4. Bosse, J. (2002). Signaling in telecommunication networks. New York: Wiley.
5. Bhat, R., & Tait, D. (2001). Java in telecommunications: solutions for next generation networks (pp. 15–53). New York: Wiley.