if (window.mozRTCPeerConnection) { util.browserisms = 'Firefox'; } else if (window.webkitRTCPeerConnection) { util.browserisms = 'Webkit'; } else { util.browserisms = 'Unknown'; } exports.RTCSessionDescription = window.mozRTCSessionDescription || window.RTCSessionDescription; exports.RTCPeerConnection = window.mozRTCPeerConnection || window.webkitRTCPeerConnection || window.RTCPeerConnection;