Cisco Headset Adapter | PC Headset Adapter for Cisco IP Phones - YouTube
VoiceJoy Corded RJ9 Phone Headset Binaural with Noise Canceling Microphone ONLY for Cisco IP Phones: Such as 7942 7971 8841,8845, 8851, 8861,8945, 8961, 9951, 9971 etc : Amazon.com.au: Electronics
Plantronics Wireless Headset for Cisco IP Phones CP-7945G and CP-7942G