r foresight and initiative in writing the pioneering first edition of this book, for inviting me to co-write the second edition, and for entrusting me with it. I hope that I have maintained, in the view of you, the reader, the high standards that Toby set. I would like to thank Susie, for her faith, love, and tolerance. I would like to acknowledge Dick and Nancy, for inspiring and teaching me that our most worthwhile work is collaborative. I would like to thank Bailey and Evan, for their love and inspiration. I would like to thank Sister Joan Maiers, SNJM, and Bill Haworth for their profound effects on my writing and my life. I would like to acknowledge Dr. W. Edwards Deming and Les Paul for demonstrating what one can accomplish by passionately practicing what he loves and believes. I would like to acknowledge Jessica Kersey at Polycom, Jean Rosauer at Tandberg, Michael Lentfer at Sprint, and Dan Hanrahan at VCON for their generous assistance. I would also like to acknowledge Jeff Hutkoff, PhC, for sharing his market insight, and Jim Luffred for sharing his knowledge of mobile communications. Jenny Child, at Comotiv, Allison Lattanze, at VSPAN, and Bob Friedler, at Comp View were also helpful. Thanks to Stan Jones for providing refreshments and music, and keeping TheWorkingStiffs alive while I was writing. The contributors to the standards organizations are the unsung heroes and pioneers who, along with the early adopters, deserve credit for removing barriers to worthwhile communications. It is a thrill to learn about and report on their work. James R. Wilcox, CISSP would like to acknowledge my mentor Jim Wilcox for sharing his vision and insight into the world of video communications. The opportunity to contribute to the 4th Edition of this work that has been wrought through SO much of Jim's tireless personal effort is one I will treasure throughout my life. More importantly, want to acknowledge my friend Jim Wilcox whose consistent advice and persistent encouragement are exemplified in his passion for life, his