be discriminated and defined depending on voip cos db as shown in fig1 when a remotely received voip u201c setup u201d message contains media information a system at the called party performs voip cos processing by analyzing the information and referring to a response codec policy of the system at the called party referring to fig4 when the service class is level 1 for the setup message the codec used is g 711 the silence suppression is disable and the multiframe count is set to 1 for the connect message the priority of the codec is set to an order of g 711 gt g 729 gt g 723 and the silence suppression is set to disable when the service class is level 2 for the setup message the codec used is g 711 the silence suppression is set to enable and the multiframe count is set to 3 for the connect message the priority of the codec is set to an order of g 711 gt g 729 gt g 723 and the silence suppression is set to enable when the service class is level 3 for the setup message the codec used is g 729 the silence suppression is set to enable and the.