Administrator’s Guide for Yealink Video Conferencing SystemsxivCamera Control Protocol ................................................................................................................ 195Output Resolution .......................................................................................................................... 199USB Configuration .......................................................................................................................... 200Video Recording ............................................................................................................................ 201Screenshot ..................................................................................................................................... 203Tones ............................................................................................................................................. 204System Management .............................................................209Directory ........................................................................................................................................ 209LDAP .............................................................................................................................................. 214Call History ..................................................................................................................................... 219Search Source List in Dialing .......................................................................................................... 221Dual Screen .................................................................................................................................... 221Default Layout of Dual Screen ................................................................................................. 222License ........................................................................................................................................... 223Device Type License ................................................................................................................ 2238-Way Conference License ...................................................................................................... 224VCS Integrated with Control Systems ............................................................................................. 226Configuring Security Features................................................227User Mode ..................................................................................................................................... 227Administrator Password ................................................................................................................. 228Web Server Type ............................................................................................................................ 229Transport Layer Security ................................................................................................................. 232Secure Real-Time Transport Protocol ............................................................................................. 239H.235.............................................................................................................................................. 243Attack Defense in Public Network .................................................................................................. 245Abnormal Call Answering ........................................................................................................ 245Configuring Safe Mode Call .................................................................................................... 246System Maintenance ..............................................................249Upgrading System Firmware .......................................................................................................... 249Upgrading VCC20 Camera Firmware .............................................................................................. 250Importing/Exporting Configuration ................................................................................................ 250Resetting to Factory ....................................................................................................................... 251SNMP ............................................................................................................................................. 252Troubleshooting .....................................................................257Troubleshooting Methods .............................................................................................................. 257Viewing Log Files .................................................................................................................... 257Capturing Packets ................................................................................................................... 260