Laser communication

Use a laser to send a message through the air. Use a fibre optic to send the signal around corners

This consists of a transmitter which converts an electical audio signal to a laser light signal and a receiver which does the opposite. This means you can send light across a room if you can aim the laser accurately enough.

If something gets in the way (like a planet) you can use a mirror to reflect the light around a corner, or use an optical fibre to bend the light around the surface. It makes a good analogy to how satellites and optical fibre communications work.