Administrator‘s Guide for Yealink Video Conferencing SystemsviiiPreparing the Network............................................................................................................. 29Configuring LAN Properties ..................................................................................................... 30DHCP ................................................................................................................................. 30Configuring Network Settings Manually .......................................................................... 33Configuring Network Speed and Duplex Mode ..................................................................... 35LLDP .......................................................................................................................................... 37VLAN......................................................................................................................................... 41802.1X Authentication .............................................................................................................. 44H.323 Tunneling ........................................................................................................................ 49Configuring the System for Use with a Firewall or NAT .......................................................... 52Reserved Ports ................................................................................................................... 53NAT .................................................................................................................................... 56H.460 Firewall Traversal .................................................................................................... 57Intelligent Firewall Transversal ................................................................................................ 58Quality of Service .................................................................................................................... 59VPN ........................................................................................................................................... 62Configuring Call Preferences ................................................. 65Configuring SIP Settings........................................................................................................... 65Configuring H.323 Settings ...................................................................................................... 68Codecs ..................................................................................................................................... 71Call Type................................................................................................................................... 72Do Not Disturb .......................................................................................................................... 74Auto Answer ............................................................................................................................. 75Call Match................................................................................................................................ 76History Record .......................................................................................................................... 77Bandwidth ................................................................................................................................ 78Configuring System Settings .................................................. 81General Setting........................................................................................................................ 81Site Name.......................................................................................................................... 81Backlight of the VCP40 Video Conferencing Phone ......................................................... 82Language .......................................................................................................................... 83Time and Date................................................................................................................... 84Automatic Sleep Time ....................................................................................................... 91Hide IP Address................................................................................................................. 92Relog Offtime .................................................................................................................... 93Key Tone ............................................................................................................................ 94Audio Setting ........................................................................................................................... 95Audio Output Device ........................................................................................................ 95Audio Input Device............................................................................................................ 97Volume............................................................................................................................... 98Adjusting MTU of Video Packets .............................................................................................. 99