2THINGS YOU SHOULD KNOWUSER ORIENTATIONThe DS Series keysets incorporate buttons or “keys” that are used to access or acti-vate the many features of your office phone system. The DS 5021D keysets incor-porate 21 programmable buttons. These 21 buttons are arranged in three rows ofseven across the face of the keyset. Any of the system features or functions can beprogrammed to these buttons.The three buttons above the top row of programmable buttons are soft keys.These buttons assist in the use of the system features and functions.Lines from the telephone company are “C.O. lines.” Calls on these lines are referredto as “outside calls.”Your system can have individual C.O. line keys or lines may beassigned to groups. When they are in a group, you access a line by dialing anaccess code or pressing a route button. For example, dial 9 or press a “LOCAL” but-ton to get a local outside line. If Least Cost Routing is used, pressing the “LCR” but-ton will automatically select a preprogrammed C.O. line according to what digitsare dialed. Each line in the system is numbered, beginning with 701, then 702, 703,etc.Direct Station Selection (DSS) buttons are programmed to ring specific stations.You can press a DSS button instead of dialing the extension number.CALL INDICATIONSThe buttons on your phone have light emitting diodes (LEDs).These are tri-coloredLEDs that light green, red or amber (green and red together).Intercom calls, also called internal calls, always appear on your CALL buttons. Theywill always light green.You can have up to eight CALL buttons, but at least two arerecommended.Outside calls appear on individual line buttons if they are assigned. When an indi-vidual line is not assigned to its own button, it will appear on a CALL button.Your outside calls will light green on your keyset and red on other keysets. Younever lose sight of your calls while they are on hold.They stay right where you putthem and are identified with a green flashing light.