IMS Multimedia Telephony service has been standard in 3GPP as the replacement circuit switched telephony service in cellular networks. Multimedia telephony service consists of several components of services such as voice, video and text. In addition to an overview of the Multimedia Telephony service, this book focuses on the modern media processing methods, which enable the quality of packet switched voice and video telephony not only to match but also possibly exceed the quality of circuit switched telephony. Key features: detailed description of how Multimedia Telephony sessions are established and controlled-analysis show the capacity and quality of VoIP and Multimedia Telephony in cellular networks Coverage of other IMS services such as PoC specified by 3GPP and OMA QoS appropriate description and a radio bearer for Multimedia Telephony explanation of the radio interface modern, especially the High Speed Packet Access, which is based on concepts such as link adaptation and fast hybrid ARQ The possibility of current standards and future covered in this book makes an indispensable resource for engineers, designers and researchers in VoIP, telecommunication companies and universities teaching and conducting research in the field of telecommunications.