The primary goal of Quality of Service (QoS) is to make network service better and more predictable by providing dedicated bandwidth, controlled jitter and latency, and improved loss characteristics. QoS achieves these goals by providing tools for managing network congestion, shaping network traffic, using expensive wide-area links more efficiently, and setting traffic policies across the network.
Since your voice is travelling over the WAN, I was just wondering if you've got some sort of agreement with your service provider.
You can mark your traffic all you like, but if your SP aren't in synch with you then you might run into trouble.
Another thing worth mentioning is the fact that if you let your traffic "burst" above the agreed rate, your traffic (voice and data) is likely do be dropped sometimes regardless of the QoS marking because of the discard eligibility.
I would suggest you explore using Traffic Shaping.
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