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Troubleshooting Solutions
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Intermittent voice is mainly caused by packet loss, due to network congestion, and jitter, due to message recom-
bination of transmission or receiving equipment (for example, timeout handling, retransmission mechanism, buf-
fer underrun).
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Noisy equipment, such as a computer or a fan, may cause voice interference. Turn off any noisy equipment.
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Line issues can also cause this problem; disconnect the old line and redial the call to ensure another line may
provide a better connection.
There is no sound when the other party picks up the call
If the caller and receiver cannot hear anything - there is no sound at all when the other party picks up the call, the
possible reason could be: the phone cannot send the real-time transport protocol (RTP) streams, in which audio
data is transmitted, to the connected call.
Try to disable the 180 ring workaround feature.
Related Topic
Play the local ringback tone instead of media when placing a long-dis-
tance number without plus 0
Ensure that the 180 ring workaround feature is disabled.
Related Topic
Camera and Video Issues
The video quality is bad
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Ensure that the display device is with the suitable resolution.
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Check whether the packet has been lost.
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Ensure that camera settings are configured correctly, such as brightness and white balance.
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Avoid high-intensity indoor light or direct sunlight on the camera.
You cannot preview local video when the phone is idle
If the camera is properly connected to the IP phone but there are no images on the screen when you launch Cam-
era or swipe down from the top of the screen and then tap Video, you may need to replace the camera.
There is some dazzle light on the images when previewing the local
video
If the camera lens is oily or soiled, there may be some dazzle light on the images. Please try to clean it up.
Wi-Fi and Bluetooth Issues
The wireless signal strength is low
Ensure the IP phone and your gateway/ router are within the working range and there is no obvious interference
(walls, doors, and so on.) between them.
The phone cannot connect to Bluetooth devices all the time
Try to delete the registration information of the Bluetooth device on both IP phone and Bluetooth device, and then
pair and connect it again. Contact Yealink field application engineer and your Bluetooth device manufacturer for
more information.
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