Some asterisk hacks for radios.

## Ring monitoring

We need to turn on lights when phones are supposed to ring, or when they are calling. This AMI-based  Python
application will extract the relevant bits.

## Transfer back

We want to send people on air when the DJ presses `#9`.
The DJ will then be put with MusicOnHold.
When they press `9`, they can talk again with the person that was on air.
If any of them hangs up, the call will end for the other one.