Amazon.com: Wantek Corded Telephone RJ9 Headset Monaural with Noise Canceling Microphone for Call Center Telephone Systems with Plantronics M10 M12 M22 MX10 Amplifiers or Cisco 7942 7971 Office IP Phones(F600C1) : Electronics
Plantronics 26718-01 Cable Phone to M10 or M12 Adaptor