Spotted---You can call Obi devices with webrtc now, but the set up seems to be challenging some die hards.
Bascially, because it's SIP based the Obi devices can route calls to any SIP endpoint and vice versa. By creating a simple Chome widget the really intelligent folks behind Obi have come up with a way to make their devices, and thus the phones connected to them more accessible. Think of Chrome being the softphone. Since they also have Android and iOS apps, I'm wondering if the apps become reachable from Chrome to a mobile device.
OTT with WebRTC is getting very interesting.