Direct Connect Headset The Plantronics A10 Direct-Connect headset cable is for call centers that use both Plantronics Polaris brand headsets and amplified headset solutions like the M12 or M22 Vista combined with any h-series headset (e.g. H251). The A10 adapter cable allows for Plantronics standard H-Series headsets (e.g H251 SupraPlus) to be connected to direct-connect telephones (equipped with A10 compatible RJ9 (smaller version of RJ11 modular jack) port). Flexibility and inventory reduction - agents can be issued one headset as they move between both types of phones. Amplifier not required. Plantronics Part Number: 66268-02 The following list of telephone manufacturers offer phones with built-in A10 compatible RJ11 headset ports. 3COM, Comdial, ESI, NEC, Nortel Networks, Toshiba, and SciTec. Replaces Polaris Cables 27190-01