Poly 85Q78AA

Overview

The Poly 85Q78AA is the APS-11 Electronic Hook Switch Cable designed to give you seamless control over desk phone calls using a compatible Plantronics headset. It allows you to answer or end calls remotely without needing to physically pick up the handset, improving your workflow and reducing distractions. This cable supports a wide range of Siemens desk phones and other models that use the same electronic hook switch protocol, making it a versatile addition to your office setup.

Key features

• Enables remote call answer and end functions directly from your Plantronics headset, so you can stay productive even when away from your desk
• Supports multiple Siemens desk phone models and other compatible phones using the electronic hook switch standard
• Compatible with Plantronics Savi 700 Series, C5500 Series, MDA200, and Savi Office headset systems for broad headset integration
• Replaces the older APS-10 cable and adds support for the Plantronics On-line Indicator, which signals your busy status to colleagues
• Eliminates the need for a mechanical handset lifter, resulting in a quieter and less cluttered workspace
• TAA compliant, making it suitable for government and regulated environments requiring this certification

Key specs

• Product type: Electronic Hook Switch Cable
• Compatibility: Siemens desk phones and other EHS standard phones
• Headset compatibility: Plantronics Savi 700, C5500, MDA200, Savi Office Series
• Supports Plantronics On-line Indicator accessory
• Compliance: TAA certified

Connectivity and compatibility

This cable connects your Plantronics headset base to compatible desk phones, transmitting electronic hook switch signals that allow call control without manual handset lifting. It works with a variety of Siemens phone models and other brands that follow the same EHS protocol, ensuring broad compatibility in professional environments. The integration with Plantronics headset systems enhances call management and user convenience.

Ideal uses and environments

The APS-11 cable is well suited for sales teams, customer support agents, and office professionals who spend significant time on calls and need the flexibility to move around without missing important conversations. Its TAA compliance also makes it a reliable choice for government offices and regulated workplaces where certification is required. By reducing desk clutter and noise, it supports a more focused and efficient work environment.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

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After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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