M2000 Series Meridian Digital Telephones Page 19 of 104Meridian 1 Telephones Description and SpecificationsM2216ACD Headset interfaceUsing the Program key, you can adjust the headset/handset interface of theM2216ACD-1 to optimize performance.The M2216ACD-1 is compatible with most headsets. Amplified headsets arestrongly recommended. Three settings are provided:• Interface 1 (i.e. Plantronics type)• Interface 2 (Liberation)• Interface 3 (Handset)Note: It is recommended that the headset user try using their headsetwith each of the three settings to determine which works best for them.Trial with both internal and external calls is also recommended in eachsetting to determine optimum performance.Note: When the amplified headset is used, there are two choices ofvolume control: the rocker control on the telephone and the switch on theheadset. The settings which provide for the clearest communication withthe least amount of distortion are when the amplifier has a higher settingthan the telephone volume control.The supervisor and agent jacks are not interchangeable. A headset must beplugged into the agent jack if the telephone is to receive ACD calls.Note: Any recording device connected to the receive path of an M2000Series Meridian Digital Telephone must meet these requirements:• isolate power source from the headset/handset jack• connect in parallel across pins 3 and 4 of the handset/headset jack• load impedance at least 8K ohms across the audio band