Provide a way to Mute the Audience.
We need some way to mute the audience using the phone keypad, such as pressing *4 like in Lync 2013. I have heard participants swearing as they are trying to get their computer to cooperate with the conference. Sometimes a participant will generate feedback if they join with both the phone and the computer audio. We need a way to mute them so the conference is not interrupted.
I was amazed that this option does not exist. I was told by MS support that you can do this if the audience uses the client and utilizing a MS approved headset.. 95% of the users I know use their cell or desk phones. Very lame !
David McKnight commented
You can mute the audience as a default participant action in your meeting options. You should try just doing this in advance.