Poly EHS APV-63 - electronic hook switch adapter for phone - 38734-11 - Headset Accessories - CDW.com
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Plantronics CS540 & Cisco APC-42 Electronic Hook Switch (EHS) Adapter Combo Package| 84693-01 & 38350-12
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Amazon.com: Poly (Plantronics + Polycom) Plantronics - Electronic Hook Switch APU-76 (Poly) - Cable for DECT and 900 MHz Headset - One Touch Call Control, Black (211076-01) : Everything Else
Poly APU-76 - electronic hook switch adapter for headset - 211076-01 - Headset Accessories - CDW.com
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