I'm using Twilio click-to-call for conference calls. There is a Chrome user in Portugal who was able to hear the call but couldn't speak.
His microphone works when I speak to him by Skype. QiqoChat is apparently connected to his microphone, because he couldn't connect to Skype until he closed my app (apparently to release his mic).
How would you recommend I troubleshoot this? It worked for 20 other users just fine but not this one.