IMS: IP Multimedia Concepts and Services in Mobile Domain, Second Edition, builds on the success of previous best-selling edition, providing comprehensive coverage of IMS? mobile phone with today's technology has been very successful and shows the enormous value communicating with peers while being mobile, and with increasingly available smarter multimedia terminals, the communication experience will be something more than just exchanging voice. Hence the Third Generation Partnership Project (3GPP) has developed standards for multimedia SIP-based machines, known as IP services? The IMS? The main feature of the Second Edition include: Two new chapters push-to-talk over cellular and group management. Additional new material includes: fixed and mobile convergence, interworking between IPv4 and IPv6 in the IMS, combined circuit-switched and IMS services (combinational services), IMS security procedures and alternative session establishment. Written in a way that allows readers to choose the level of knowledge and understanding they need to get on the IMS, this volume will have instant appeal to a broad audience began to include marketing managers, research and development engineers, network engineers, develop models, test engineers and students .