Yealink VC120 User Manual page 167

If the system fails to join the scheduled conference, you need to:
Check if the conference is expired.

Check if you enter the wrong conference information.

Check if the current time is more than 5 minutes before the scheduled start time.

Why does the system leave the scheduled conference automatically when the conference
is ongoing?
Checks whether more than one system registered the same YMS account join the same
conference. The conference only allows one of them to join the conference, the former system
which joined the conference will leave the conference automatically.
Why doesn't the display device display the time and date correctly?
Check whether you have configured the system to obtain the time and date from the SNTP
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
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 video conferencing 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 local 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.

Time & Date on page 46.
Troubleshooting
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