Webrtc: Pcobserver#onaddstream Is Not Invoked For Call Upgrade

I am developing webrtc client in android. Web to web, web to device, device to web call audio-only, audio-video call, upgrade to audio-video call from audio-only is working fine. T

Solution 1:

I changed the label for SDP and media tracks (audio/video) in every negotiation and now the things are working as expected! FYI!