Yealink VC Series Administrator's Guide

Administrator‘s Guide for Yealink Video Conferencing Systems
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button on the remote control or on the display device.
 Check whether you have selected the correct video input source. You can try to
switch video input source.
 If you have configured the system to obtain the time and date from the NTP server
automatically, ensure that SNTP server and timezone are configured correctly in
the system and whether the connection between the system and NTP server is
working properly.
 If you have configured the system to obtain the time and date manually, ensure
that you have configured the time and date correctly.
 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.
 Ensure that the number you are calling is correct.
 If the near site is forced to use encryption, ensure that the far site enables
encryption too. For more information about call encryption, refer to Secure
Real-Time Transport Protocol on page 141 and H.235 on page 143.
 Ensure the far site supports the same call protocol as the near site.
 Check whether the network is available.
 Check whether the LAN property is configured correctly. For more information
about LAN property configuration, refer to Configuring LAN Properties on page 30.
 Check whether the system has enabled the hide IP address feature. For more
information about disabling the hide IP address feature, refer to Hide IP Address on
page 92.
 Check whether the system has configured firewall and NAT correctly. For more
information about, refer to Configuring the System for Use with a Firewall or NAT on
page 52.

Yealink VC Series Specifications

General

Brand	Yealink
Model	VC Series
Category	Conference System
Language	English