Jabra 14201-43 Electronic Hook Switch Control Adapter for PRO 920/925 and Motion Office for Cisco IP Phones 6945 - Black : Amazon.co.uk: Electronics & Photo
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Plantronics APS-1 Electronic Hook Switch (EHS) Cable For Siemens and Aastra Phones | New or Refurbished | From £25.00 | 38347-01 - PMC Telecom
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USB-powered Wall Hook Is A Thing Now And I Am Not Even Making This Up - SHOUTS