If you're one of those people who absolutely must answer your phone no matter what meeting you're in, then this might at least avoid some embarrassment. You answer by pushing the green button, you push another button that plays a pre-recorded greeting in your voice to the caller that says "hello", then you decide to take it or not and push another button that either says "I'm in a meeting, hold on one second while I walk out of the room" or one that says "I'm actually in a meeting, can I call you back as soon as it's finished? Okay, thanks. Bye." And you never have to say a word out loud.
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