Voice traffic prioritization using layer 7 filters
Modified layer7 capability from release 1.21 onwards will have more controls of several layer7 protocols. As an example Voice traffic can be prioritized by adding QoS reservations for SIP and RTP layer7 protocols. Here is the list of supported layer7 protocols:
https://www.mushroomnetworks.com/docs/what-protocols-are-supported-for-layer-7-filters/
Go to the ADVANCED tab and add QoS reservations according to the traffic type (make sure you have configured the QoS shapers as well. The following example prioritizes SIP & RTP traffic with a guaranteed rate of 3000 kbps (assuming you have ~30 simultaneous calls each at ~100kbps rate).
QoS reservation for SIP traffic:
QoS reservation for RTP traffic:


