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Cisco Headset 532 - Wired Dual w USB Headset Adapter (CP-HS-W-532-USBA=)
Cisco Compatible Headset Adapters for 7940, 7960, etc.
RJ9 Phone Headset - Plantronics Compatible QD Headset + Virtual Compatibility Smart Adapter for Cisco Avaya Nec and Most Phones - Walmart.com
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Headset Adapters for Cisco IP Phones
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Cisco Headset 532 - Wired Dual w USB Headset Adapter (CP-HS-W-532-USBA=)