Plantronics HIS-1 Direct Cable Adapter For Select Avaya Deskphones

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Plantronics HIS direct cable adapter is used as an Avaya Direct Connect Cable which connects an H-series headset into a compatible phone. When using any H-series headset, a Direct Connect Cable or amplifier is required to plug in between your headset and phone. Using a Direct Connect Cable will save you money versus an amplifier, but an amplifier will provide optimum sound quality and volume controls.