... 3905Meridian Option M3110, 3310, 3820NEC Electra Elite DTerm, Series E, Models DTU-8, DTU-8D, DTU-16, ... DPT-32, DPT-32DMITELSuperset 4000 Series, Models 4015, 4025, 4125, 4150 Mitel IP Series, Models 5020, 5020i, 5140, ... CA or HA option modulesPolycom SoundPoint IP Phone Series, Models 500 (rev. 5 or later), ... S12, S50, T10, T20, T50, T100, T110, SP-04, SP-05, PLX-400, PLX-500 T100 call center headset ...