Best Five Plantronics Headsets/Headset Accessories – May 2012 1) 66268-03 A10- Direct Cable – The A10 direct connect cable is a clean way to connect H series headsets to most telephones that have an RJ9 headset jack and don’t say Cisco or Avaya. Give us a call at 800-914-7996 to make sure your phone qualifies for this cost-effective way to connect your headset to a … Continued