Amazon.com: VoiceJoy Smartphone 3.5mm Jack to RJ9/RJ10 Plug for ONLY Cisco IP Phones Adapter Cable : Electronics
USB Plug to RJ9 Headset Adapter For Headset Work with Computer PC Laptop Avaya Nortel Yealink Cisco VIOP POE IP Telephone Skype Video Phone - Walmart.com
Cisco Headset Adapter for 2.5mm cell phone headset