Yealink VC Series Administrator's Manual

Also see for VC Series: Quick start guide

Contents

Administrator‘s Guide for Yealink Video Conferencing Systems160button on the remote control or on the display device. Check whether you have selected the correct video input source. You can try toswitch video input source. If you have configured the system to obtain the time and date from the NTP serverautomatically, ensure that SNTP server and timezone are configured correctly inthe system and whether the connection between the system and NTP server isworking properly. If you have configured the system to obtain the time and date manually, ensurethat 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 usesthe 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 enablesencryption too. For more information about call encryption, refer to SecureReal-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 informationabout LAN property configuration, refer to Configuring LAN Properties on page 30. Check whether the system has enabled the hide IP address feature. For moreinformation about disabling the hide IP address feature, refer to Hide IP Address onpage 92. Check whether the system has configured firewall and NAT correctly. For moreinformation about, refer to Configuring the System for Use with a Firewall or NAT onpage 52.