I would like to create a dial plan which adds announcements to the parties calling in and those in the room itself. When someone has finished entering the security code of any conference and is accepted into the conference, the caller would be able to hear how many people are in the room prior to joining. For those which are in the conference, they would here a beep or rather a tone when someone joins the conference.
I would suggest a little section which does
Meetmecount before it passes them into the conference. Not exactly what you wanted, but I think you would have to rewrite the meetme to do what you really want.
Not sure on the tones, sounds as asterisk already does that with new user entering and joining.