Michael F. Finneran 
Voice Over WLANS [PDF ebook] 
The Complete Guide

For networking and RF/wireless engineers, and graduate students who want a solid overview of voice over WLANs/Vo IP technology (wireless local area networks / voice over internet protocol), this book covers voice coding, packet loss, delay and ‘jitter’, and ‘echo’ control, and shows how to combine both WLAN and Vo IP technology to create effective voice over WLAN systems. Finneran also describes how to integrate voice over WLAN systems with cellular networks. This is not just another WLAN-only book nor a Vo IP-only book; instead, it integrates both topics into a coherent whole.* Gives complete details on integrating voice and data services on WLANs, including wide area networks* Explores quality of service (Qo S) and security issues* Step-by-step descriptions of how to plan and implement voice over WLAN networks