Support QoS Through VPN Tunnel

This has been discussed a couple times in the forums. Specifically some ability to condition traffic via QoS over the VPN tunnel. In my case I would like to provide precedence attributes to various services running across the tunnerl. In particular, VoIP. I have to VoIP PBXs that communicate over my inter-office VPN tunnel and I would like to give this traffice precendence (both IP - diffserv - precedence along with bandwidth precedence) over other non-VoIP traffice occuring over the tunnel

Reference: https://community.netgear.com/t5/VPN-Firewalls/Point-to-Point-VPN-best-practices-for-VOIP/td-p/1247105