4 stars (An excellent primer.) - As an expert in rare violins with extensive experience at Christie's, Sotheby's, and Antiques Roadshow, I always thought I was able to telephony. Turns out I didn't know the first thing about it! Live and learn, I always say. Thanks for opening my eyes, Mr. Harte. 5 stars (A good switchover for Telecom people) - This is a good introductory book for Telecom people who are looking to get into IP Telephony.The diagrams are good and the explanation are easy to understand.I even talked to the author and he was helpful. 1 stars (Introduction to IP Telephony) - Do NOT buy this PDF if you are a serious professional and want to work for VoIP. You will waste your money buying this and waste your time reading this. I do not think I can give even one star to this book. However Amazon does not accept review if I do not give at least one star hence I have give that rating. ... Althos Publishing :: Telecommunications :: Technology & Telecommunications :: Technology :: Networking - General :: Computers :: Lawrence Harte :: :: Introduction to IP Telephony - Why and How Companies are Upgrading Private Telephone Systems to use
1 stars (Little useful information) - This book tries to dumb-down SIP. It looks like it wants to be a training manual for a "Learning SIP" course, but doesn't provide any real technical detail. It is poorly written and a tedious read. This is the first sentance: "SIP is a standardized technology that allows for the sending of voice, data, and video between communication devices on public (e.g. Internet) or private (e.p. local area networks) data networks." ... and it doesn't get any better after that. SIP Demystified by Gonazlo Camarillo is a much better read. It is engaging and well written, providing useful information for IT engineers, managers and technologists. ... Althos Publishing :: Telecommunications :: Technology & Telecommunications :: Technology :: Networking - General :: Computers :: David Bowler :: Lawrence Harte :: :: Introduction to SIP IP Telephony Systems - Technology Basics- Services- Economics- and Installation
4 stars (Good Introduction) - This is a very good starting guide for somebody not used to billing processeses. Moreover there is not so much books dealing with this discipline. I am lookinf forward the full version if there gonna any... 3 stars (Good High-Level Overview for Beginners) - This is a good, but not terribly polished, high-level overview of telecom billing processes. If you've spent any time at all with telecom billing systems you'll be familiar with 95% of the information in this document, if not more. The material is appropriate for anyone who's getting involved with telecom billing for the first time or who has been working on the periphery of the billing systems and would like to know more. Don't expect a lot of detail - there can't be a lot in a document that contains only 31 pages of content written using large type and a lot of white space. For example, the entire section on Hardware and Software consists of the following paragraph: "The hardware usually includes high performance computers that operate proprietary software. Due to the complexity of hardware and software billing systems, continuous training is required in order to ensure quality services to the customers and to provide revenue assurance." 4 stars (Introduction to Telecom Billing) - This is a good book for anyone who needs a quick and succint introduction on the billing process in Telecom industry without getting into technical details. It is a easy read. Will save days of research on google. ... Althos Publishing :: Telecommunications :: Technology & Telecommunications :: Technology :: Lawrence Harte :: Avi Ofrane :: :: Introduction to Telecom Billing - Usage Events- Call Detail Records- and Bill Cycles
Barcode Software/ Lawrence Harte 
