When VoIP prioritization is enabled, the RTP media traffic associated with the configured SIP port will be guaranteed. It has a higher priority than class 1~4, it is called Class VoIP. It will occupy up to 50% of the bandwidth, depending on the number of your calls. So there are 5 classes: Class 1, Class 2, Class 3, Class 4, and Class VoIP.
The category RTP in the APP QoS setting is for all RTP streams, and the priority is lower than Class VoIP.
For example, if the total bandwidth is 100Mbps, we configure it as class 1 %25, class 2 %25, class 3 %25, and class 4 %25. If Class VoIP has reached up to 40Mbps, then Class 1 will be only allocated 25% of the remaining bandwidth 60Mbps.
It still works even when ‘Use Random Port’ is enabled in the IP Phone because it is based destination of the SIP port, not the source SIP port.
The VoIP prioritization and bandwidth control are based on DPI, not DSCP/ToS.
The More You Know
- TAP is not recommended for VPN connection with different subnets.
- Hardware Acceleration reduces CPU usage and achieves better throughput results.
- Make sure you disable secure DNS in the browser setting to ensure the Router’s Firewall > content security >DNS filter works.
