References
- Gonzalo Camarillo, Miguel-Angel, and Garcia-Martin 'The 3G IP Multimedia Subsystem (IMS): Merging the Internet and the Cellular Worlds," Wiley & Sons, 2006, ISBN 0-470-01818-6
- 3GPP TS 23.002 v7.1. 0: 'Network Architecture"
- 3GPP TS 23.228 v7.4.0: "3rd Generation Partnership Project; Technical Specification Group Services, and System Aspects; IP Multimedia Subsystem OMS); Stage 2 (Release 7)"
- ETSI ES 282 007 v1.I.1: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISP AN); IP Multimedia Subsystem (IMS) Functional architecture," jun. 2005
- ETSI TS 182 012 v1.1.1: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based PSTN!ISDN Emulation Subsystem; Functional architecture," Apr. 2005