 Specification (Release 8), 3GPP TT 22.228 (V8.1.0), Technical Specification Group Services and System Aspects, 3GPP, March 2006. 2. IP Multimedia Subsystem (IMS); Stage 2. Technical Specification (Release 6), 3GPP TS 23.228 (V6.9.0), Technical Specification Group Services and System Aspects, 3GPP, March 2005. 3. Koukal, M., and Bestak, R. (2006) Architecture of IP Multimedia Subsystem. Multimedia Signal Processing and Communications, 48th International Symposium EL-MAR-2006, June 07-09, 2006, Zadar, Croatia, pp. 323-326. 4. Khartabil, H., et al. (2006) The IMS: IP Multimedia Concepts and Services, John Wiley & Sons, New York. 5. Willie, W.L. (2002) Broadband Wireless Mobile, John Wiley & Sons, New York. 6. Zhou, Z., et al. (2007) Interworking of WiMAX and 3GPP networks based on IMS. IEEE Communications Magazine, 45 (03), 144-150. 7. All-IP Core Network Multimedia Domain. 3GPP2 X.S0013-000-A (V1.0), 3GPP2, November 2005. 8. Wilde, A., et al. (2007) IMS interoperability and conformance aspects. IEEE Communications Magazine, 45 (03), 138-142. 9. Technical Specifications and Technical Reports relating to the Common IP Multimedia Subsystem (IMS). Tech- nical Specification (Release 8), 3GPP TT 21.202 (V1.1.0), Technical Specification Group Services and System Aspects, 3GPP, March 2009. 10. Common IMS Impacts to 3GPP2 Specifications. 3GPP2 S.R0137-0 (Version 1.0), 3GPP2, December 2008. 11. Motorola IMS Applications, Motorola Inc., 2007. 12. Bradlee, N. (2008/2009) IMS Test and Monitoring. European Communications, Winter. 13. Wikipedia. available at http://en.wikipedia.org/wiki/Main_Page, 14. Fokus, F., and Stamatis K. (2004) Mobile payment: A journey through existing procedures and standardization initiatives. IEEE Communications Surveys & Tutorials, 6 (04) 44-46, Q'2004. 15. Mobile Commerce: opportunities and challenges. GS1 Mobile Com, February 2008. 16. C. DVB Project Office (2009) DVB Fact Sheet: DVB-H Broadcasting to Handhelds, April 2009. DVB-H: Broadcasting to Handhelds, DVB Fact Sheet, DVB Project Office, April