Skype for Business Audio Quality

Good Evening all,

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I'm looking for some guidance/assistance on getting Skype for business cofigured corretly with in our business.

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We are running Skype for business Online, installed locally on client machines.

QoS is in place on our VPLS, dscp with identiefer af31. I've requested for our provider to add af41 as this is missing in their config also.

We are still seeing really bad audio quality accross our sites. This can be anything from the audio dropping for 3-5 seconds too just general bad audio quality (Like talking in a fish tank). During the SFB meeting, it regulary complains about signal quality althought windows is showing full wi-fi signal. We've had a heatmap done across the office and there is no black spots or areas with weak signal.

All of our sites feed into an asa 5516 via our service provider. The ASA is configured with 2 interfaces, inside and outside. All the traffic going out to the internet goes through the ASA. QoS is not configured on the ASA.

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Does anyone have any suggestions?

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thanks