Leverage on mobile devices and SQUAREPING patent-pending QRCall technology, SQUAREPING introduces PINGPAD, a video cal Intercom offering cool visitor call functions … without an electronic call board. Instead, a plain call board with a QR code as below is the only thing needed for service deployment. Visitors simply scan the QR code using their own mobile phone to place a mobile or Internet audio/video call to a resident or extension without ever touching the call board or waiting for access.