Voice over Internet Protocol (VoIP) is gaining much attention today, as more companies and individuals switch from standard telephone service to phone service via the Internet. As an added bonus, it is also cheaper, because VoIP is free of the endless government regulations and tariffs imposed on telephone companies. VoIP is only filled with hack potential, and VoIP Hacks is the practical guide from O'Reilly that presents these possibilities to you. Among the quick and clever solutions showcased in the book are those for: measure the readiness of VoIP on a corporate network using SIP, H.323, and other signal specification that provides low-layer security in VoIP environments using IP hardphones, analog telephone adapter, and server softPBX deal with and avoid the most common VoIP deployment mistakes In reality, VoIP Hacks contains only a small portion of VoIP knowledge to serve as an introduction to the world of VoIP and teach you how to use it to save money, be more productive, or just impress your friends.