Thanks DigiPhoneMan, thats good idea too. While wait to figure out on how to do your suggestion, for temporary I am only enable the call trasfer 'Await Answer' option and use the screenig option. At least the new participant will asked for name and anounce it in the room, also we could check through CoralNagigator all the participant inside the conference room.
Just for your info, even your suggestion also from Riman and Coral looks easy, but it will take time for me to figure out. My installer and Tadiran is not responsive, so I have to figure out by my self.
