For what is the option max_port and min_port in turnserver.conf?

I found in the ubuntu manpage

   max_port = number
          Maximum allocation port number.

   min_port = number
          Minimum allocation port number.

Is this just the range where the TURN should listen when a client tries to find the TURN server?
Or is it the range where all the communication (video, sound) goes over, when the connection is established?