Top 5 Plantronics/Headsets Direct Accessories – December 2011 1) 66268-03 – Direct Cable (66268-03) – The A10 direct connect cable is an economical way to connect H series headsets to certain telephones that have an RJ9 headset jack, such as Nortel, Mitel and NEC. Please contact our sales team at 800-914-7996 to determine if your phone can use one. 2) 26716-01 Amplifier/Cisco Direct Cable – This cable from Plantronics is designed to fit almost all … Continued