PBX Systems for IP Telephony

This book is a bit outdated since it is from the last decade but it met most of my objectives since I wanted to learn more about the fundamentals of voice communications including: PSTN, ISDN, PBXs, etc.This is not a introductory book for novices.I felt that this book was not proofread enough, i.e. the editors were not thorough enough as I did find quite a few errors: duplicate sentences, typos, o instead of 0, etc.

Received item as advertised & in a timely manner!

After only 29 pages I found myself constantly asking "what is that, and when did the author define it?". Additionally, there are enough oddly worded sentences that I am unable to follow what is being said. Perhaps I am not the intended audience for the book, but since Sulkin did not include a forward, I can't tell. I am trying to use this as an initial guide to PBX, and find it lacking enought that I am now looking for another book.

Today it is very hard to find an individual who can take off, fly, and land the IP, IP PBX, and PBX plane. Most so called Telephony experts can only do one, two at best.