What is Voice over Internet Protocol (VoIP)? Is a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks.

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Tierzero Hosted PBX Made Simple
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PBX videos

Tierzero Hosted PBX Made Simple

Visual Dialplan 2 overview (for Asterisk PBX)

Motorized camera controlled by Asterisk PBX

Nortel PBX Backend

GigaOM Mobilize 2009 - Toktumi Line2 Virtual PBX