System Maintenance - Yealink VC400 User Manual

User Guide for the VC400 Video Conferencing System
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.

System Maintenance

How to reboot the phone?
Press
1.
Press or
2.
Enter admin password (default password: 0000) in the Admin Password field.
3.
Press
4.
Press or
5.
Press or
6.
142
(Menu soft key) to enter main menu.
to scroll to the Advanced menu.
or press (Enter soft key).
to scroll to Reboot & Reset, and then press
to scroll to Reboot, and then press
.
.