setting up Asus RT-AC68U to properly route voip traffic through vpn

[Galaxysurfer]

Asus RT-AC68u
ver Asuswrt-merlin : 380.65
Openvpn client1 connected strict dns policy routing implimented
Grandstream HT-502 plugged into LAN port routed through vpn

unable to get voip working properly
router firewall is turned off currently
Adaptive QoS activated

phone gives me busy signal




how do i configure & secure this properly?

 

[RMerlin]

Routing VoIP through VPN is usually not a good idea, as VoIP is highly latency-sensitive.

router firewall is turned off currently

Don't do that.

 

[Galaxysurfer]

only temp till i figure out proper settings
so far determined i need to use bridge setting on ata so signal not trying to go through 2 nats

trying to set up Grandstream HT502 with Asus RT-AC68U with vpn service so all play nice & secured