Yealink VC120, Administrator'S Manual

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Troubleshooting
289
information, refer to Far-end Camera Control on page 211 .

Ensure that what you are controlling is the remote camera. Select
More
->
Near/Far
Camera
during an active call and then select the remote video image.

Ensure the far site supports the same call protocol as the local site. For more information,
refer to
Camera Control Protocol on page 212 .
Why is the video quality bad?

Ensure that the display device has suitable resolution.

Check whether the packet has been lost. For more information on packet loss, refer to
Viewing Call Statistics on page 284 .

Ensure that camera settings are configured correctly, such as brightness and white balance.

Avoid high-intensity indoor light or direct sunlight on the camera.
Video & Audio Issues
Why can’t I hear the audio during a call?

Ensure that the local audio output device is connected correctly.

Use audio diagnose to check whether the audio device is working normally.

Ensure that the ringer volume is not set to the minimum.

Check whether the far site is muted.
Why can’t the far site hear the local audio?

Ensure that the local audio input device is connected correctly.

Check whether the local site is muted.

Check whether the system has enabled the auto answer mute feature.

Check whether the system has enabled the auto dialout mute feature.
Why can’t I hear the other site clearly during a call?

Ensure that the speaker volume of the far site is not set too low.

Muffled audio reception from the far side may be caused by highly reverberant rooms.
Speak in close proximity to the phone.

Adjust the priority order for your audio codec if you have chosen a low-bandwidth audio
codec to be first. For more information, refer to
Audio Codecs on page 143 .

For best results, ensure that the caller is using a Yealink video conferencing system. Audio
quality from your video conferencing system will vary when calling a non-Yealink system.

Dust and debris may cause audio quality. . Do not use any kind of liquid or aerosol cleaner
on the phone. A soft, slightly damp cloth should be sufficient to clean the top surface of