DruCall 1.1.0 for Drupal has just been released.
The main improvement over 1.0.0 is that it now permits the TURN servers to be configured instead of using hard-coded STUN server addresses. TURN servers (such as reTurn from reSIProcate or TurnServer.org) provide the ability to relay media streams on a public IP to ensure guaranteed NAT traversal. Support for ICE/STUN/TURN is a mandatory part of the WebRTC specification.
For more details and download, please see the DruCall web site