Hi, A strange (but not so) requirement has come up and i will be glad to hear some suggestions: extension A calls extension B B is on another call at the moment and has call waiting enabled both on the phone and in asterisk. How can the caller (i.e. A) hear a tone (or something similar to indicate that B is busy - as it happens on mobiles/landlines ?) Is it possible ? One thought was to have another extension and a queue and send the new call to the queue with music... Any ideas ?