Button FeatureTwo-way Transfer Used to record a conversation into the mailbox of a specific extension.One-touch Two-way Transfer Used to record a conversation into the mailbox of a specific extension withone touch.Live Call Screening (LCS) Used to monitor your own voice mailbox while an incoming caller is leavinga message and, if desired, intercept the call.Voice Mail TransferUsed to transfer a call to the mailbox of a specified extension. Also usedto access the Unified Messaging system or the voice mail features of aVPS with one touch.Network Direct StationSelection (NDSS)Used to access an extension connected to other PBXs in the network withone touch.CTI Used to access CTI features.Check-in Used to switch the room status of extensions from Check-out to Check-in.Check-out Used to switch the room status of extensions from Check-in to Check-out.Cleaned-up Used to switch the room status of extensions between Ready and NotReady.Primary Directory Number(PDN) Used to make and receive both outside and intercom calls.Secondary Directory Number(SDN)Used to show the current status of another extension, call the extension,and pick up or transfer calls to it.Directory Number (DN)(KX-UT series SIP phones[except KX-UT113/KX-UT123]/S-PS only)Used to make intercom or outside calls.User Manual 271.1.4 Before Operating the Telephones