This outdoor intercom with h.264 video connects to your VoIP phone system providing clear two-way audio, visual confirmation and secure access control.This device is constructed to protect it from vandalism while the weatherproofing protects it from your elements.If you are looking for an easy to install, secure access control intercom with camera and built-in dry contact to trigger doors and gates, this is it.CyberData has maintained one of the most comprehensive list of IP PBX servers certified to work with CyberData VoIP Products.