Plantronics APP-51 Electronic Hookswitch for Polycom Phones

Plantronics APP-51 – Electronic Hookswitch for Polycom Phones

The Plantronics APP-51 is an Electronic Hookswitch (EHS) adapter designed specifically for Polycom desk phones (including the VVX, SoundPoint IP, and SoundStation IP series). If you use a Plantronics wireless headset with a Polycom phone and are tired of manually lifting the handset every time you answer a call, this small adapter is the solution. It enables true remote call control – answer, end, and mute calls directly from your headset – without the need for a bulky mechanical handset lifter. Setup is plug‑and‑play: connect the adapter between your Polycom phone and Plantronics headset base, and you’re ready to enjoy hands‑free efficiency.

How It Works

The APP-51 connects to your Polycom phone’s dedicated headset port (RJ9 or RJ45, depending on the model) and to your Plantronics headset base (such as the CS500 series, Savi 700 series, or Voyager Focus UC base) using the included cables. Once installed, the adapter translates the phone’s electronic hookswitch signals. When you press the call control button on your headset, the adapter tells the phone to go off‑hook exactly as if you had lifted the handset. Press again to end the call, and the phone hangs up automatically. The adapter also supports mute and volume adjustments from your headset. No external power supply is needed – the APP-51 draws power directly from the phone’s headset port. For a complete wireless office experience, pair this EHS adapter with a high‑quality wireless headset – explore our selection at FindHeadsets for Plantronics and Poly models that are fully compatible.

Compatibility & Design

The Plantronics APP-51 is compatible with a wide range of Polycom phones, including:

Polycom VVX series (VVX 101, 201, 300, 301, 400, 401, 500, 501, 600, 601)

Polycom SoundPoint IP series (330, 331, 335, 430, 450, 550, 560, 650, 670)

Polycom SoundStation IP series (7000)

It works with Plantronics headset bases that feature an EHS port, such as:

Plantronics CS500 series (CS510, CS520, CS530, CS540)

Plantronics Savi 700 series (W710, W720, W730, W740)

Plantronics Voyager Focus UC base

The adapter is compact (approx. 2 x 1.5 x 1 inches) and sits discreetly between your phone and headset base. It includes a short RJ9 or RJ45 cable (depending on your phone). The unit is black with a small status LED. No drivers or software are required – it’s pure plug‑and‑play.

Why Choose This Product

Without an EHS adapter, using a wireless headset with a Polycom phone forces you to either manually lift the handset or use a mechanical handset lifter – both inconvenient and prone to wear. The APP-51 is a much cleaner, more reliable solution. It provides true electronic hookswitch control: answer, end, and mute directly from your headset. It also improves audio quality because the signal stays electronic rather than passing through a mechanical connection. For call center agents, busy executives, or anyone taking many calls daily, the time saved and reduced motion strain add up significantly. Plus, it keeps your desk tidy and professional. This adapter is specifically optimized for Polycom phones, ensuring flawless operation.