ITC Telecom Technology, LLC has extensive experience with the successful design, deployment and support of Voice over IP (VoIP) networks, IP-PBX systems and traditional business phone systems, and provides the following VoIP resources for the benefit of our clients:
VoIP 101 White Paper - What you Need to Know before Deploying Hosted VoIP
VoIP 101: Best Practices Table for LAN/WAN Configuration Options
TCO Cost Comparison: Premise Based PBX vs. Hosted VoIP Phone Systems
VoIP for Dummies Book (XO)
SIP Training by TECHtionary.com
Avaya Certified Installation Specialist (ACIS)
Please contact us for sample Visio Network Diagrams for VoIP.