I dreamed I was answering calls from a phone that didn’t exist

I was sitting at the console, same as always—headset tight, fingers on the keys—but the line was open and no one was on it. Just silence, then a voice saying, 'I need help,' but not through the speaker. Through the air. Like it was coming from the wall. I looked down and my hands were holding a phone made of glass and wire, glowing faintly, but I’d never seen it before. I answered anyway. Said, 'Dispatch, what’s your emergency?' And the voice said, 'You already know.' Then I woke up with my hand still reaching for nothing.