PLANTRONICS QUIK DISCON. --CABLE HIC-1 AVAYA - To directly connect your headset to specific Avaya IP phones including the following models: 2410 2420 4406 4412 4424 4406D+ 4412D+ 4424D+ 4424LD+ 4610SW 4620 4620SW 4621SW 5410 5420 5610 5620 6416D+M 6424D+M. The Quick Disconnect (QD) capability allows the headset to detach without losing the call