Lawrence Harte — новинки

Internet Telephone Basics explains how and why people and companies are changing to Internet Telephone Service. Learn how much money can be saved using Internet telephone service and how you can to use standard telephones and dial the same way while

This "Introduction to IP Telephony" book explains why companies are converting some or all of their telephone systems from dedicated telephone systems (such as PBX) to more standard IP telephony systems. These conversions allow for telephone bill

All-in-one, application-and service-focused look at 3G cellular Want to know exactly how existing wireless technologies are evolving into a vital third generation -- and how this trend impacts the bottom line? You’ll find the answers in