For Avaya 46xx series, 56xx series, 24xx series, 54xx series, 6416D+M, 6424D+M, 94xx, 95xx, and QE4610 phones.
Headset direct connect HIC-1 cord (part # 49323-01) for these AT&T/Lucent/Avaya Models Only: 1408, 1416, 2410, 2420, 4424D+, 4606, 4610, 4610SW, 4612, 4620, 4620SW, 4621, 4621SW, 4622SW, 4625SW, 4625SW, 4630, 4630SW, 5410, 5420, 5610, 5620, 5621, 6416D+M, 6424D+M, 9404, 9406, 9408, 9504, 9508. Use this HIC-1 cord to connect any Plantronics H-series headset directly to your telephone headset port. This provides you with "on-hook" functionality so that you won't have to lift your telephone handset off the receiver for every call when using your Plantronics headset. Only purchase this cable if you have one of the phone models listed above. You will NOT need to purchase a Plantronics amplifier. This cord is all you need to connect your Plantronics H-series headset to your phone. The cord has a modular plug at one end and a QuickDisconnect at the other end which connects to any Plantronics Call Center headsets (H-Series).
Also see our Plantronics Avaya Direct Connect Headset FAQ and Avaya HIC user guide