I was too busy yesterday to blog this news, but thought it was still important enough to mention. Yesterday, I received an email stating that Avaya, a traditional PBX manufacturer had "widened its lead in worldwide enterprise Internet protocol (IP) telephony revenues." The report showed Avaya as the #1 vendor in IP telephony revenue. This caught my eye for a couple reasons.

An Asterisk-based PBX proved to be the solution to one enterprise's communications growing pains.

Asterisk is the most widely known open source PBX, but other developers are making competitive products in the unified communications market.

author: Paul Mahler asin: 0975999206 binding: Paperback list price: $49.95 USD amazon price: $49.95

VoIP Telephony with Asterisk is the best-selling introduction to the leading open source PBX software. You'll learn how to provision telephony, install and compile Linux and Asterisk, and configure an Asterisk dial plan for both analog and SIP telephones. The book's 300 pages cover Cisco and snom telephones, Digium boards, faxing, voicemail, basic IVR and a variety of related topics.