| Contents | viiConfiguring SIP IP Call by Proxy...................................................................................................................................180Configuring Ringback Timeout...................................................................................................................................... 180Configuring the Auto Refuse Timeout........................................................................................................................181Auto Answer...........................................................................................................................................................................181Answering a Call Automatically When not in a Call................................................................................181Answering Multiple Calls Automatically....................................................................................................... 182Muting Auto-Answered Calls..........................................................................................................................................182Muting Auto-Dialed Calls................................................................................................................................................. 182DND (Do Not Disturb).......................................................................................................................................................183Enabling DND when Not in a Call..................................................................................................................183Enabling DND during an Active Call............................................................................................................. 183Enabling Fast Audio Call for CP960 Conference Phone...................................................................................... 184Managing the Directory............................................................................ 184Local Directory...................................................................................................................................................................... 184Adding Local Contacts and Conference Contacts....................................................................................184Importing a Local Contact List.........................................................................................................................186Exporting Local Contact List..............................................................................................................................187Editing Local Contacts..........................................................................................................................................188Deleting Local Contacts.......................................................................................................................................188Yealink Cloud Contacts......................................................................................................................................................189Enterprise Directory.............................................................................................................................................................189LDAP.......................................................................................................................................................................................... 190LDAP Attributes.......................................................................................................................................................190Configuring LDAP...................................................................................................................................................191Meeting Whitelist.................................................................................................................................................................193Adding Meeting Whitelist.................................................................................................................................. 194Deleting the Meeting Whitelist........................................................................................................................194Meeting Blacklist.................................................................................................................................................................. 194Adding Meeting Blacklist....................................................................................................................................194Deleting the Meeting Blacklist......................................................................................................................... 194Managing the Call Log.............................................................................. 195Saving History Record........................................................................................................................................................195Adding a History Record to the Local Directory.................................................................................................... 195Deleting History Records..................................................................................................................................................195Deleting a History Record..................................................................................................................................196Deleting Multiple History Records..................................................................................................................196Deleting All History Records............................................................................................................................. 196Placing Calls from Call History.......................................................................................................................................197Placing a Call.............................................................................................. 197Placing a Call by Entering a Number..........................................................................................................................197Placing a Call from the Search Result.........................................................................................................................198Placing a Call from the Search Result by CTP20.................................................................................................... 199Editing Numbers Before Calling.................................................................................................................................... 199Editing Numbers before Calling by CTP20............................................................................................................... 199Configuring the Security Features........................................................... 200Collaboration Data Security Control............................................................................................................................200Configuring the Auto Logout Time..............................................................................................................................201Transport Layer Security (TLS)........................................................................................................................................201