intrigeri wrote (12 May 2015 11:12:37 GMT) :
FWIW, at least one of the getUserMedia tests "successfully" plays audio here: https://mozilla.github.io/webrtc-landing/gum_test_aec.html
Ignore this, sorry for the noise.
The thing that successfully plays audio is the "background audio" HTML5 audio element, that has nothing to do with getUserMedia (if I got it right), and is thus fully expected to work.