Yealink VC400, User Manual

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Troubleshooting
139
server automatically. If the system fails to connect to the SNTP server, contact your system
administrator for more information. You can also configure the time and date manually. For
more information, refer to
Time & Date on page 48 .
How to obtain the IP address of the system?
Three are three ways to obtain the IP address of the system:

The IP address of the system is shown on the top right corner of the display device.

Press (
Menu
soft key) on your remote control and select
Network
.
The display device shows the network information about the system.

Press on the VCP40 phone when the phone is idle and select
Network
.
The LCD screen of the phone displays the network information about the system.
Why does the system fail to call the far site?

Check whether the network of the near site is available.

Check whether the network of the far site is available.

Check whether the far site enables the DND feature.

Check whether the accounts have been registered correctly, and the system uses the
appropriate account to call the far site.

Check whether the local system can ping the IP address of the remote system successfully.

Ensure that the entered call information is correct.

Ensure that the called party is powered on.

Check whether the far site rejects your call.

Check whether the firewall blocks the inbound traffics from the other site.

Check whether the far site has already up to maximum call-in limitation.

If the near site is forced to use encryption, ensure that the far site enables encryption too.

Ensure that the far site supports the same call protocol as the near site.
Why does the system fail to call the far site via IP address?

Ensure that the network is connected correctly.

Ping the IP address of the far site. Contact your system administrator if it fails.
Camera Issues
How to adjust room lighting?
You can alter the environmental lighting and background colors of your environment to obtain
the best video quality. If light levels are too low you may consider adding artificial lighting.