Yealink T5 Series, Руководство администратора

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Troubleshooting Solutions
453
Get poor sound quality during a call
If you have poor sound quality/acoustics like intermittent voice, low volume, echo or other noises, the possible reasons
could be:
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Users are seated too far out of recommended microphone range and sound faint, or are seated too close to sensitive
microphones and cause echo.
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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, buffer
under run).
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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 pos-
sible 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
Early Media
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
Early Media
Camera and Video Issues
The video quality is bad
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Ensure that the display device has 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 camera 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 Camera
application 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 cam-
era
If the camera lens is oily or soiled, there may be some dazzle light on the images. Please try to clean it up.