FaceTime calls are also silent!
When the update arrived that enabled Macs to make and receive calls using an iPhone, problems arose for me. I could hear other people, but they couldn’t hear me. I tweaked the microphone settings, reset the FaceTime settings and phoned Apple to resolve the issue, but nothing’s changed. This could have been a good hands-free solution. Dave Leaf Other people can’t hear you at all? Or other people can faintly hear you but can’t make out anything you are saying? I’ve had a few of reports of the latter, particularly from those with MacBooks as desktop replacements. The normal positioning of a laptop for use on a desk doesn’t put the microphone near enough for you to be heard over normal background noise; using it on your lap helps, but the best solution is an external headset. Unfortunately, Yosemite appears to have stopped working with some external mics for FaceTime and Handoff. Try typing sudo killall coreaudiod into Terminal. Depending on your mic this might work for both, just for FaceTime, or not at all.