Audio conference using flash media server

Hello All,
I am new in this forum. I am also newly using Flash Media Server. I have stucked with a problem. I am working on a audio conference programming. At a time one user can talk. I am able to programming an one to one communication. I am able to generate a que nos beside each user. The number signifies the q number of the user. When the number becomes 0 he can start to talk.

Is there anybody to hel me?
Thanks in advance.

Regards,
Rajib