I searched for VLAN traffic prioritization on GTAC knowlegebase and found these commands:
set policy profile 1 name "PriorityForPhones" cos-status enable cos 5
set policy rule admin-profile vlantag 10 admin-pid 1
These commands gives "cos 5" priority for all vlan 10 fraffic which is what we need. I tried this on A4H124 and it worked as expected but we have some A2H124 that are connected to our PBX systems. These A2H124 models does not accept "set policy" commands. So how can I achieve this goal on A2H124?