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APP-5/APP-50/APP-51 (Polycom EHS Cable) Product Information

Electronic Hook Switch (EHS) cables provide communication between your phone and Plantronics headset, enabling you to answer and end your calls using your headset call control button.

Installation Information

Click here for installation instructions.

Compatibility Information

EHS cables are designed to work with specific phone models and Plantronics products. The table below provides the compatibility information for the APP-5, APP-50, and APP-51.

EHS CablePhone Make and ModelCompatible Plantronics Product
Part No. 38438-01
  • SoundPoint IP 320/321
  • SoundPoint IP 330/331
  • SoundPoint IP 430
  • SoundPoint IP 550
  • SoundPoint IP 560
  • SoundPoint IP 650
  • SoundPoint IP 670
  • VVX 1500
CS Series:
  • CS50
  • CS55
  • CS70/CS70N
  • CS351N
  • CS361N
Part No. 38439-01
Same as aboveCS500 Series:
  • CS510
  • CS520
  • CS530
  • CS540
Savi 700 Series:
  • W710
  • W720
  • W730
  • W740
  • W745
Savi Office:
  • WO100
  • WO200
  • WO300
  • WO350
Part No. 38439-11
Same as aboveSame as above

* The difference between the APP-50 and APP-51 is that the APP-51 includes a connector for your on line indicator (OLI) light.

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