На основе ответа выше и данных по портам с сервера Zoom:

/ip firewall mangle
add action=mark-connection chain=prerouting connection-mark=no-mark dst-port=3478-3479 new-connection-mark=VOIP passthrough=no protocol=udp
add action=mark-connection chain=prerouting connection-mark=no-mark dst-port=8801-8802 new-connection-mark=VOIP passthrough=no protocol=udp
add action=mark-connection chain=prerouting connection-mark=no-mark dst-port=8801-8802 new-connection-mark=VOIP passthrough=no protocol=tcp
add action=mark-packet chain=prerouting comment=VOIP connection-mark=VOIP new-packet-mark=VOIP passthrough=no

/queue tree
add name=queue1 parent=wan-interface priority=1 queue=default
add name=queue2 packet-mark=VOIP parent=queue1 priority=2 queue=default
add name=queue3 packet-mark=no-mark parent=queue1 priority=8 queue=default