A descriptive account on telecommunications networks has been presented in this profound book. It elucidates the basics of fast developing networks as well as the advanced concepts and future expectations of Telecommunications Networks. It recognizes and analyzes the most important research issues in Telecommunication and it consists of information contributed by the top researchers, industry and academic professionals. This book also contains surveys of current publications that thoroughly examine important fields of interest like: 3G/4G, IMS, modeling, quality of service, eTOM etc. The book covers topics like New Generation Networks, Quality of Services, and Sensor Networks. It will serve as a good reference for both PhD and MA students.