How do we setup priority for voice traffic?

Check to see if your routers support diffserv and if they do, then you
can enable it in the voip under the IP settings if using H.323 firmware.
Our TOS bit is set to 0x40 in hex or in binary 0100 0000.

If you are using Proprietary firmware instead of the H323 firmware, then we do not support diff serv. Then your router would have to give priority based on the voips IP address.