Fixes for the most common Yealink CM20 Ceiling Microphone problems, from the quickest checks to when to contact Yealink. Start at the top: most issues are a setting, a cable or firmware.
What the CM20 Ceiling Microphone has
Check the problem against what this model actually has:
- Microphones: 16 omnidirectional, 8 beam outputs
- Network: AES67; 1 x RJ-45
- Power: PoE (IEEE 802.3af, Class 3), 9 W rated
- In the box: CM20 microphone, white and black mesh covers, assembly fixing bracket, dust cover, bracing bridge (1 pair), mounting screws and bolts and quick start guide
Quick checks
- Restart it: unplug the network cable for 30 seconds, then reconnect.
- Reconnect the cables, using the ones that came in the box.
- Update the firmware. How
Mic not detected
- Reseat the cable at both ends (at the MeetingBar A40 or its mic hub) and use the Yealink cable it came with.
- Stay within the host's maximum number of microphones.
- Update the host's firmware; the microphone updates with it.
- Restart the host system.
Mute button out of sync
- Mute from the host or the meeting app once to resync.
- Update the host's firmware: mute sync fixes come with host updates.
Won't turn on
- Check the switch port supplies PoE (802.3af) and has enough power budget left.
- Try a known-good cable and a PoE injector to rule out the switch.
- If it starts and then restarts, the port may not supply enough power.
When to contact Yealink
If none of this works, the device may need warranty service (Yealink warranty: 24 months for Teams Room Systems, Collaboration Bars, BYOD kits, USB room cameras, VC room systems, Zoom Room kits and Meeting Boards; 24 months for personal speakerphones/headsets/USB cameras; 12 months for SIP and Teams desk/conference phones). Open a case on Yealink support. Bought from us? Contact us and we'll help with the claim.
More CM20 Ceiling Microphone guides
- CM20 Ceiling Microphone buyer's guide: specs and price
- CM20 Ceiling Microphone: setup guide
- CM20 Ceiling Microphone: mounting and placement
- CM20 Ceiling Microphone: Teams, Zoom and Google Meet
- CM20 Ceiling Microphone: what room size it covers
- CM20 Ceiling Microphone: price and total room cost
- CM20 Ceiling Microphone: full specs
- CM20 Ceiling Microphone: alternatives compared
- All Yealink microphones compared
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