Nermeen Ismail provided a cover-to-cover review of the book, lending considerable expertise in video and voice over IP.

Jesse Herrera also provided a full review, verifying all parts of the text in minute detail.

The authors are particularly grateful to Stuart Taylor for providing a number of suggestions and comments on the introduction and architecture chapters; to Tripti Agarwal for taking time to review the H.323 section and provide her insight on CallManager signaling implementation details; to Judy Gulla for doing a thorough review of the SIP chapter and providing valuable comments; to William May for reviewing the media control chapter; and to Dan Wing, who was instrumental in reviewing the security chapter.

We thank all the folks at Cisco Press. We especially thank Kristin Weinberger and Dayna Isley, who helped take the basic material and create a real Cisco Press book. Thank you.

Thiya Ramalingam: I want to thank Johnny Chan, Shantanu Sarkar, and Walter Friedrich for believing in me and encouraging me in every way with my career at Cisco. I also want to say thank you to the architects and engineers who worked with me on the distributed video conferencing project that was the inspiration for me to start this book.

Steve Fry: I want to thank Thiya Ramalingam for inviting me to collaborate with him on this book and to Scott Firestone and the reviewers for their assistance in developing my contribution.