II, Telecom Journal of Australia, 47(2), 1997. Carrier Grade Voice Over IP. Daniel Collins. McGraw-Hill, 2001. Network Evolution the Ericsson way. Erik Örnulf and Steinar Dahlin, Ericsson Review, 4, 1999. Acknowledgement: Miltos Tricopoulos assisted significantly in writing the chapters on access network, packet backbone and control network. REFERENCES AND ACKNOWLEDGEMENTS FOR SEPARATE NETWORK PARTS Service Network Here I would like to mention contacts with Christoffer Andersson, who wrote the book GPRS and 3G Wireless Applications. See: http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471414050,descCd-authorInfo. This book is one of the main references. Another contribution by Christoffer deals with Enablers - The link between Terminals, Networks and Applications. See: http://www.ericsson.com/mobilityworld/sub/articles/other_articles/enablers_the_link_ between?PU xviii References and Acknowledgements Open Mobile Alliance is another input. The principles are described in http://www.openmobilealliance.org/docs/OMA-principles.pdf Many articles in Ericsson Review deal with the service network. See for example no. 1, 2003. A meeting with some of the involved service layer staff was indeed valuable. MGW Chapter Media gateway for mobile networks. Ericsson Review, 4, 2000. http://www.ericsson.com/about/publications/review/2000_04/files/2000042.pdf.All Er- icsson Review articles are accessible by means of the general part of the address above. Control Network Chapter Control servers in the core network. Ericsson Review, 4, 2000. Packet Backbone Chapter Reference article, example: The big question: carriers that want to build out their networks must first address another fundamental issue: What type of traffic will their networks carry - and why?, See Telephony, December 13, 1999. Access Chapter There is a huge number of books and web articles available on both mobile and fixed access. Let us mention two web examples: Universal Mobile Telecommunications System (UMTS): Real-Time Multimedia in UMTS (UMTS 22.72 version 0.