Line/Programmable Buttons. Used for individual outside lines or (if no line is assigned on a button) for programming telephone or extension numbers, or system features (such as Last Number Redial). When a line is assigned, press the line button to make a call on that specific line (lights show status of line). When a number feature is programmed, press the button to dial the number or use the feature. The PARTNER-34D has 36 programmable buttons (32 with lights and 4 without lights); the PARTNER-18D has 20 programmable buttons (16 with lights and 4 without lights); the PARTNER-18 has 16 programmable buttons (all with lights); the PARTNER-6 has 4 programmable buttons (all with lights). ■ Fixed Buttons. In addition to the line buttons, the telephones have some or all of the following fixed buttons, which are already imprinted: — Intercom Buttons. Press to make (or answer) a call to (or from) another extension in the system. If you receive a call on a T1 line with Direct Inward Dialing (DID), and you cannot access that line from the line or pool buttons on your telephone, the call will appear on your Intercom button. Press the button to answer this outside call. — Feature. Press to change programmed settings or use system features. — Conf (Conference). Press to add other parties to your call. — Transfr (Transfer). Press to pass a call to another extension. — Hold. Press to put a call on hold. — Spkr (Speaker). Press to turn on and off the speaker and microphone (if available), so you can dial and have a conversation without lifting the handset. The light next to this button shows when the speaker is turned on. — Mic/HFAI. Press to turn the microphone on and off. The light next to this button shows when the microphone is turned on. Leave on to use Hands-Free Answer on Intercom (HFAI) feature. — Volume Control Buttons. Press – to decrease or + to increase the volume as follows: ■ To adjust ringer volume, press while the telephone is idle and the handset is in the cradle. ■ To adjust speaker volume, press while listening to a call through the speaker. ■ To adjust handset volume, press while listening through the handset. ■ To adjust background music volume, press while listening to music through the telephone’s speaker.