Administrator’s Guide for Yealink Video Conferencing Systems
290
the phone if necessary.
Why is the voice quality poor?
Users may receive poor voice quality during a call, such as intermittent voice, low volume, echo
or other noise. It is difficulty to diagnosis the root causes of the voice anomalies. The possible
reasons are:
Users sit too far from or near to the microphone.
The audio pickup device is moved frequently.
Intermittent voice is probably caused by voice packet loss or jitter. Voice packet loss may
occur due to network congestion. Jitter may occur due to information reorganization of
the transmission or receiving equipment, such as, delay processing, retransmission
mechanism or buffer overflow.
Noise devices, such as computers or fans, may make it difficult to hear each other's voices
clearly.
Wires may also cause this problem. Replace the old with the new cables, and then
reconnect to check whether the new cables provide better connectivity.
Why can’t I view the local video image?
Check whether the local site camera is connected to the VC400/VC120 Codec correctly.
Check whether camera is powered on, and the LED indicator illuminates green.
Check whether the camera is selected for the current video input source.
Check the screen layout to see whether the remote video image is shown in full size.
Why can’t I view the menu?
Check whether the Display1 port of VC400/VC120 Codec is connected to the HDMI port on
the display device.
Why can’t I start a presentation?
Check whether a PC is connected to the VC400/VC120 Codec.
Check whether the PC is sending a signal.
Check the call statistics to see whether the system is sharing content.
Ensure that dual-stream is configured correctly. For more information, refer to
Dual-Stream Protocol on page 196.
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