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When you share a saturated link, even "perfect" QoS won't deliver performance exactly the same as a non-saturated link. This mainly due to interface packet serialization, or hardware FIFO queuing, of the non-priority packets. However, correctly configured QoS generally delivers performance that priority traffic should be within its SLA requirements.
In other words, your VoIP will be impacted, but it shouldn't be impacted to an extent it's adverse to the call.
If your is a managed solution - tell your managed service provider "fix it".
