No Subscribers Found!
That is written to the log when a particular event is triggered, but the client application did not subscribe to that event.
A good example is the “Disconnect” event for a channel. You are not required to subscribe to the “Disconnect” event. When a channel disconnects the code looks for someone listening for that event. If no one is listening it logs that. It is useful for diagnostic purposes.
The events that log this message are:
*Disconnected Events
*New Call Events
*Digit Events
*Dial Complete Events