Asterisk: Creating A Conference That External Callers Can Call In

If you need to create a Conference that external callers can call in, you will need to create both an Extension as well as a Conference.

1. Create a Conference as per normal
2. Create an Extension as per normal
3. Edit the "Follow Me" settings of the Extension and under "Destination if no answer", point it to the Conference number.
4. Give the Extension (not Conference) number to your external callers

That's it