We have a phone vendor telling us that all of the switches and routers need QoS configured. Traditionally we only configure it on the WAN interface of the edge device as internally we have a full backplane on all the switches. This is from the vendor doc: "If VoIP traffic passes any single interface without QoS configured, the effects of quality issues are felt on a call as if no QoS is configured anywhere along the path."
Is there any validity to that?
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