The Plantronics APP-51 is an electronic hookswitch (EHS) cable for Polycom phones. The APP-51 is designed for use with Plantronics headsets in the Savi 700 series, Savi Office series and CS500 series.
The Plantronics APP-51 EHS cable allows you to take calls and end calls by the push of a button on your Plantronics headset even when you are not within arm's range of the phone, eliminating the need for a HL10 Handset Lifter.
The Plantronics APP-51 is compatible with the following Polycom phonemodels:
*Polycom IP 320/321 and IP 330/331 require 2.5mm to RJ-9 converter cable to connect to the headset port
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