1.5 Making Call Features58 Feature Guide1.5.5.3 CO Line AccessDescriptionThere are three methods of accessing a CO line.Conditions• Class of Service (COS) programming determines the CO line groups available for makingcalls ( CO Line Group Number [500]).• CO Line numbers can be referred on a CO line port basis ( LCOT CO Line NumberReference [409]).• Button AssignmentA flexible button can be customized as a G-CO, L-CO, or S-CO button as follows:It is possible to assign CO lines in the following ways:Dialing the CO Line Access number selects a CO button according to the following priority:S-CO G-CO L-CO• Direct CO Line AccessIf an extension user is on-hook when pressing an idle CO button, the proprietary telephone(PT) automatically enables hands-free operation mode. The user can dial without liftingthe handset or pressing the SP-PHONE or MONITOR button.• Group Hunting Order for Idle Line AccessAn idle CO line is selected from the CO line groups assigned for Idle Line Access. Ifmultiple CO line groups are available, the CO line group hunting sequence can bedetermined through system programming.Method Description OperationIdle LineAccess (LocalAccess)Selects an idle CO lineautomatically from the assignedCO line groups.Dial the Idle Line Access number orpress a L-CO button.CO Line GroupAccessSelects an idle CO line from thecorresponding CO line group.Dial the CO Line Group Access numberand a CO line group number, or press aG-CO button.S-CO LineAccessSelects the desired CO linedirectly.Dial the S-CO Line Access number andthe CO line number, or press the S-CObutton.Type Assignable parameterLoop-CO (L-CO)Any CO line group that is made availablefor Idle Line Access through systemprogramming is applied.Group-CO (G-CO) A CO line group is assigned.Single-CO (S-CO) A specified CO line is assigned.– The same CO line to the S-CO button and to a G-CO button– The same CO line group to more than one G-CO button– More than one L-CO button
