Connecting to a PBX or KEY Phone System:

Follow these 4 simple installation steps, and you'll have your OHP-4000 series connected to a PBX or KEY phone system in no time.

Step 1: Plug the AC adapter into a 110V power outlet.	Step 2: Plug the other end of the power cord into the 9V DC jack on the back.	Step 3: Plug the audio cable into the "audio out" jack on the back.
Step 4: Plug the other end of the audio cable into your PBX or KEY phone system's "music-on-hold" input.