http://www.usa.canon.com/cusa/support/consumer/security_video_solutions/network_cameras/vb_c500d?pageKeyCode=writeReviewPage
VB-C500D
18635
Features
Two-Way Audio (Full Duplex)
The VB-C500D can transmit and receive audio in real time from an authorized networked PC. Simultaneous two-way audio allows administrators logged in to the Admin Viewer web interface to listen in on a camera site, make announcements to the scene of the camera, or do both at the same time. An optional audio interface cable is required (WA500-VB). 
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