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The indicators on a Yealink desk phone tell you what the phone is doing. Here is what the common ones mean.

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Blinking red light in the top corner

A blinking red light in the top corner of the screen means the phone is rebooting or finishing a software update. This is normal after a power cycle, after an update, or during initial setup.
  • It stops on its own once the phone finishes restarting.
  • If it keeps blinking for more than a few minutes, unplug the phone, wait about 10 seconds, then plug it back in.
The corner light is not the same as the side keys. The buttons along the side of the phone are programmable keys (such as Busy Lamp Field or Park) and light up for their own reasons.

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Phone restarted but no longer rings for group calls

After a restart, a phone can make calls and ring on its direct extension but stop ringing for a shared group or queue. The phone is fine — its place in the group went stale. Refresh its connection:
1

Confirm it can make a call

Place an outbound call. If it connects, the phone is connected to the network.
2

Confirm direct calls ring

Call the phone’s extension directly. If it rings, the phone is registered.
3

Power cycle the phone

Unplug the phone, wait about 10 seconds, and plug it back in to refresh its connection.
Contact support if the phone still misses group or queue calls after one full power cycle.