This book is a practical guide to design, deployment, and performance analysis of voice over LTE (VoLTE), covering practical aspects and best practice of LTE/IMS network architecture/deployment and VoLTE design and performance. More specifically, it covers evolved LTE network architecture with IMS, VoLTE call flows, upper and lower layers protocols for VoLTE, and the practical aspects for designing, deploying, and performance analysis of VoLTE. The evolution of the LTE network to IMS architecture and different deployment/evaluation scenarios are presented in detail. LTE coverage and link budgets aspects are analyzed in terms of VoLTE services. In addition, capacity dimensioning of LTE network with VoLTE is conducted with different scenarios and different traffic profile. Additionally, the quality of service (QoS) aspect for VoLTE deployment and end-to-end implementation scenarios are demonstrated. A comprehensive practical performance analysis for VoLTE and comparison with legacy voice services is conducted based on field measurement results from live LTE networks. The book can be used as a practical comprehensive guide for best practices in VoLTE design, deployment, and performance analysis and LTE/IMS network architecture and dimensioning. It offers tutorial introduction on LTE networks, enabling the reader to use this advanced book without the need to refer to more introductory texts.