Today's businesses, big and small, are faced with the large-scale restructuring concerning daily communications. Enterprises are moving from the standard wired telephony to wired and wireless communication via internet protocol (IP), Wi-Fi, and cellular services. With the stabilization of these networks and the availability of dual-mode handsets multimodal voice mobility networks are becoming low cost and highly effective. This book provides practical advice on breaking down implementation and deployment. Scalable voice mobility solutions are analyzed and optimized dependent upon available budget and infrastructure options. The ultimate choice for an installation could incorporate a variety of networks. Security, fixed-mobile convergence, and emergency services are also considered in this guide for network designers, managers, and architects.