There is a webphone library from mizutech which offers webrtc whenever possible with failback to others when webrtc is not available (native plugin/flash/java):

There is a webphone library from mizutech which offers webrtc whenever possible with failback to others when webrtc is not available (native plugin/flash/java): https://www.mizu-voip.com/Software/WebPhone.aspx https://www.mizu-voip.com/Software/WebPhone.aspx