Poly APU-75D TAA Electronic Hookswitch

The Poly 85Q99AA is the APU-75D electronic hook switch adapter, a small interface that lets your Poly CS500 or CS500-XD headset take full control of a compatible desk phone. With this adapter in place you can answer or end calls without touching the handset, so you stay in the flow of work even when you stand up to grab a file, walk to a colleague’s desk, or step into a quieter corner.

Setup is straightforward. Plug the adapter into the headset base and the phone, follow the simple pairing steps, and remote call control activates immediately. No additional power brick or software is required, which means you can be up and running in minutes.

The APU-75D is TAA compliant, a point that matters for government agencies, education, and other organizations that must meet Trade Agreements Act purchasing rules. Its solid build and reliable signal path ensure clear audio and consistent performance throughout the day.

This adapter is a smart choice for reception areas, contact centers, shared office environments, and home offices where users value the freedom to move around without missing a call. By keeping your hands free and your workflow uninterrupted, it helps you work more comfortably and efficiently.

• Electronic hook switch adapter that links a Poly CS500 or CS500-XD headset to a compatible desk phone
• Enables remote call answering and ending directly from the headset
• Quick, tool-free setup with no separate power supply or software needed
• TAA compliant, suitable for government and enterprise procurement
• Ideal for busy offices, contact centers, and remote workspaces where mobility matters