Can someone explain how does this Camp-On feature works?
I was able to disable it for the past 10 years, without looking at how it works.
10 years later, someone ask me to activate it, and I have no clue how to do that.
I followed the documentation without success. I can still call my busy extension, and my set will display "CALL BACK" or "VOICEMAIL" but no CAMP-ON.
Any hint appreciated

