Choppy audio in MS Teams: Why network optimization (QoS and VLAN) sometimes does not help

Quick summary

When audio keeps cutting out or voices sound “robotic” in meeting rooms, IT teams usually look for the cause in the network and packet loss. In practice, however, if the network is configured correctly, the real cause is often overloaded AI-based processing in MS Teams, which struggles to handle the poor acoustics of glass meeting rooms.

The moment IT receives a report that “calls were cutting out again during an important management meeting”, the usual diagnostic process begins.

Network engineers analyze packet delivery and ping, check latency toward Microsoft servers and inspect the switches. But the result is often the same: the network is in perfect condition and every monitoring dashboard is green.

So why do the ends of words sound to remote branches “as if they were coming from underwater” if the internet connection is working flawlessly? The answer often lies outside the IT domain, in the physical acoustics of the room.

Which network settings minimize delay in Teams?

For reliable voice and video delivery, the standard step is to separate audiovisual communication into its own local network (VLAN). An experienced network architect also applies strict Quality of Service (QoS) rules.

In practice, correct priority settings for Microsoft Teams mean:

• Audio streams: Marked as Expedited Forwarding (DSCP 46). They receive the highest priority and move ahead of any other large file downloads on the network.
• Video streams: Marked as AF41 (DSCP 34) to support smooth video transmission.

(For non-IT managers: these technical settings create an exclusive “VIP lane” in the corporate network reserved only for video conference audio and video. This prevents a large PDF download from freezing the director’s video feed.)

If this separation is configured correctly and the network shows no packet loss, corporate bandwidth is unlikely to be the cause of choppy audio. Attention must move away from cables and switches and back to the glass walls of the meeting room.

Why does Teams audio cut out despite zero packet loss?

Platforms such as MS Teams, Zoom and Webex rely heavily on built-in modules for software echo cancellation and noise suppression.

This AI-based processing constantly tries to detect what is human speech and remove everything else that sounds like noise.

The problem appears in representative meeting rooms dominated by hard materials that create highly reflective acoustics:

• Glass walls and large windows.
• Exposed raw concrete ceilings.
• Large glossy conference tables.

When someone speaks in this type of room, a basic microphone, for example one placed under the display, does not capture only the voice. With a short delay, the microphone is also hit by dozens of confused sound reflections bouncing off the glass like ping-pong balls.

What happens inside Teams?

The AI detects this sudden reflection chaos as excessive noise and immediately pulls the “emergency brake”. It starts aggressively cutting the speech signal in order to prevent interference. To remote participants, this protective filtering sounds like a shallow robotic cut-out, where the ends of words disappear.

The accused network delivered the signal correctly. It only delivered audio that had already been damaged by the compression and filtering algorithm inside the meeting room.

Which hardware can offload Microsoft Teams from echo processing?

Modern audiovisual practice follows a clear rule: Teams software cannot and should not compensate for a poorly designed room.

There are systematic ways to permanently free IT teams from this problem using acoustically tuned technology:

• Dedicated external signal processing (hardware DSP): In larger meeting rooms, a hidden hardware processor, known as a Digital Signal Processor, is installed behind the display or in the rack. Its role is to intelligently capture and suppress unwanted physical echo from the walls before the audio ever enters the computer. This dramatically reduces the processing load placed on Microsoft Teams.
• Ceiling Beamtracking microphones: Standard table microphones capture reflections from every direction. Modern solutions use ceiling microphones with Beamtracking technology. These intelligent microphones aim the pickup zone, or beam, precisely at the person who is speaking.

Integrated solutions with guaranteed quality for IT and AV

While network stability and Quality of Service are the responsibility of IT network administrators, accurate and clean room acoustics are handled in modern projects by certified AV architects.

At MediaTech Central Europe a.s., this secure connection between IT and AV technologies is built into the standard project process.

The company is verified as the only Slovak member of the international installation network PSNI Global Alliance with the formal status of Certified Solution Provider (CSP).

Specific acoustic and beam calculations are supported by strict standards such as PSNI Global Quality Assurance and processes designed for corporate IT environments. With audio from MediaTech, you do not have to keep troubleshooting sound. It works from the moment of deployment and stops creating false network incidents.

Do you suspect that the real Teams problem cannot be solved in IT settings?

Let us diagnose it with you. Book a short, non-binding consultation where we will quickly determine with you and your IT department whether the issue lies in the network (QoS), or in the overloaded acoustics of a glass meeting room.