1.7 Useful Features1-88 Operations• 2.1 Tone / Ring Tone List• See the Installation Manual, Section 3, “Ringing Pattern Selection”.A different ringing pattern is used to distinguish intercom calls from incoming outside calls.• You can select the ringing pattern as follows in System Programming.— Exchange line: 3 patterns (A, B or C)— Extension: 3 patterns (A, B or C)— Doorphone: 4 patterns (A, B, C or D)Ringing Pattern Selection1 sABCD+Distinctive Dial TonesA distinctive dial tone will be heard from the handset if the extension user has previouslyactivated a certain feature.Dial Tone 1: Ordinary dial toneDial Tone 2: When any of the following features are activated.• Absent Message Capability• Back Ground Music (BGM) (only a proprietary telephone)• Call Forwarding• Call Pickup Deny• Data Line Security• Do Not Disturb (DND)• Electronic Extension Lockout• Message Waiting (only a proprietary telephone)• Pickup Dialling (only a single line telephone)• Remote Extension Lock Control• Timed ReminderDial Tone 3: When performing Account Code Entry and answering a Timed Reminder call.Also sent when going off-hook with an SLT which has a message in a VoiceProcessing System.• 2.1 Tone / Ring Tone List• See the Installation Manual, Section 3, “Distinctive Dial Tones”.+