HP Poly EHS Electronic Hook Switch Adapter – 85638-01, QD Compatible (85S12AA)

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The Poly EHS Electronic Hook Switch Adapter (85S12AA, part 85638-01) provides QD-compatible EHS functionality for Poly wireless headsets connected to phones via the QD adapter path — enabling remote call answer and end where a standard EHS cable alone does not complete the hook switch circuit. Verify compatibility with your specific headset base and phone combination before ordering. Key Features QD Compatible EHS: EHS adapter for QD headset base configurations. Enables Remote Call Answer: Completes the EHS circuit for hands-free auto-answer functionality. Genuine Poly Accessory: Correct signal specification for compatible phone and headset combinations. Technical Specifications Specification Detail HP SKU 85S12AA Poly Part Number 85638-01 Function EHS hook switch adapter Connector QD compatible Show more