Use the System Media Port Range window to configure the allowed UDP port number range for RTP and RTCP media for the system. You have the option to configure up to 25 percent of the ports at either the top or the bottom of the configured port range as high priority ports. If the SBC experiences congestion conditions, packets received on ports outside the high priority media range can be dropped automatically, but the SBC does not drop packets from ports within the high priority range. Therefore, if you choose to configure SIP signaling ports within the media port range, Sonus recommends they reside within the high priority port range so that packets are not dropped.
On the SBC main screen, go to All > System > Media > Media Port Range. The Media Port Range window opens.
The following options appear:
Make any required changes and click Save.