Direct Connect Cable for Avaya 9600 & 1600 - HIS - Business Telecom Products
Plantronics HIS Adapter Cable with Quick Disconnect for Avaya 9600 Phones (72442-41) - Newegg.com
Avaya HIS-1 Headset Adapter Cable (PL-72442-41) - Grade A
Amazon.com: Headset Cable Adapter A10-16 Direct Connect Compatible with Plantronics Headsets, GTW 66268-03 by Global Teck, Compatible with EncorePro, Plantronics, Addasound, VXI : Electronics
Amazon.com: QD Adapter HIS Cable for Plantronics and VoiceJoy Headsets QD Adapter for Yealink Phones and Workable for Avaya IP 1608, 1616, 9601, 9608, 9611, 9611G, 9620, 9630, 9631, 9640, 9641, 9650, 9670 : Electronics