Nobody says "telephone" anymore. Maybe the remote nature of communication is implied, and the only interesting part is that you're talking about audio? Not extremely happy with the sketch, it turned out kind of chubby and odd. Some lines were entertaining. Referenced from physical object.
Something less complicated today. Again from life. Was kind of tricky to fit all the details in, I probably squished it a bit. You should be able to see what it's meant to be though.