| Contents | viiManaging the Directory....................................................................................... 178Local Directory................................................................................................................................................. 178Adding Local Contacts and Conference Contacts............................................................................... 178Importing a Local Contact List............................................................................................................ 180Exporting Local Contact List............................................................................................................... 181Editing Local Contacts......................................................................................................................... 181Deleting Local Contacts....................................................................................................................... 182Cloud Directory................................................................................................................................................ 183Enterprise Directory..........................................................................................................................................183LDAP.................................................................................................................................................................183LDAP Attributes................................................................................................................................... 184Configuring LDAP................................................................................................................................184Searching for Contacts......................................................................................................................................187Placing Calls to Contacts................................................................................................................................. 187Meeting Whitelist..............................................................................................................................................188Adding Meeting Whitelist.................................................................................................................... 188Deleting the Meeting Whitelist............................................................................................................ 189Meeting Blacklist.............................................................................................................................................. 189Adding Meeting Blacklist.....................................................................................................................189Deleting the Meeting Blacklist.............................................................................................................189Managing the Call Log........................................................................................ 189Saving History Record..................................................................................................................................... 190Adding a History Record to the Local Directory............................................................................................ 190Deleting History Records................................................................................................................................. 190Deleting a History Record....................................................................................................................191Deleting Multiple History Records...................................................................................................... 191Deleting All History Records...............................................................................................................191Placing Calls from Call History.......................................................................................................................192Placing a Call........................................................................................................ 192Placing a Call by Entering a Number..............................................................................................................192Placing a Call from the Search Result.............................................................................................................193Placing a Call from the Search Result by CTP20........................................................................................... 194Editing Numbers Before Calling......................................................................................................................194Editing Numbers before Calling by CTP20.....................................................................................................194Configuring the Security Features......................................................................195User and Administrator.................................................................................................................................... 195Configuring an Administrator Password.............................................................................................. 195Enabling the User Role........................................................................................................................ 196Configuring the Auto Logout Time................................................................................................................. 196Transport Layer Security (TLS)....................................................................................................................... 196Supported Cipher Suites....................................................................................................................... 197TLS Transport Protocol........................................................................................................................ 197Managing the Trusted Certificates List................................................................................................ 199Managing the Server Certificates......................................................................................................... 201Secure Real-Time Transport Protocol (SRTP)..................................................................................... 202H.235..................................................................................................................................................... 204Defending against Attacks....................................................................................................................205