IP telephony and the technologies that make voice/data convergence possible.
This will cover both
Local Area Network (LAN)
Wide Area Network (WAN) solutions and provides the information that a Carrier, Integrator and Enterprise employee needs to have to design, build and initiate IP telephony. Do not become a victim of early installer disease. Take the time necessary to learn the technology of IP Telephony to empower you to properly install, maintain, and troubleshoot your solution or deployment