HP Poly APP-51 Electronic Hook Switch Cable (85Q60AA, 38439-11) | Like New
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1 Year WarrantyIncludedThe HP Poly APP-51 Electronic Hook Switch Cable (85Q60AA) was designed EHS system that allows for complete remote call control by connecting suitable Poly wireless headsets to specific desk phones. This electronic hook switch cable offers a clear, dependable interface so customers can answer, end and switch calls straight from their headset buttons rather than depending on a mechanical handset lifter. Employees can roam freely throughout the workplace while still having complete control over incoming and active calls on their desk phone, resulting in a more seamless UC experience. The HP Poly APP-51 EHS cable removes the clutter and possible sources of failure associated with mechanical lifters, making it ideal for professional office, contact center and hybrid work environments. It transmits signaling that electrically mimics going off-hook and on-hook between the base of a compatible Poly/HP wireless headset system and compatible desk phone models. This implies that there is no need to physically lift the handset when a user hits the call button on the headset because the phone goes off-hook and the call is answered. In order to provide dependable interoperability and maintain crucial call features like ring indicator and remote answer, the APP-51 is tuned for particular phone families, often including supported Avaya/Alcatel and comparable systems. This connection is an inexpensive addition that greatly improves the user experience for companies that are standardizing on wireless headsets for their desk phone fleet.
Quick specs
- Product Type
- EHS Adapter
- Device supported
- Desk phone + wireless headset (phone cable accessory)
- Color
- Black
- Cable type
- Proprietary EHS interface cable (phone-side plug + headset-base plug)
- TAA status
- TAA-compliant variant for government/regulated procurement
Key Features
Electronic hook switch integration between Poly wireless headset bases and supported desk phones, enabling remote answer/end without a mechanical lifter.
Direct remote call control from the headset—answer, end, and sometimes toggle calls using headset buttons for a more natural workflow.
Clean, compact cabling that connects discreetly from the headset base to the phone’s EHS/auxiliary port, reducing desktop clutter compared with physical lifters.
Optimized compatibility profile for specific IP or digital phone families (often including common enterprise brands), ensuring consistent signaling behavior.
No moving parts, making it quieter, more reliable, and less prone to mechanical wear than handset lifters.
Simple plug-and-play setup, typically requiring only a quick configuration on the phone and headset base to enable EHS functionality.
Benefits
- Hands-free freedom with full control where staff can walk away from their desk and still answer or end calls from the headset, boosting responsiveness and reducing missed calls.
- Improved ergonomics and user comfort eliminates the need to reach for the handset each time, supporting healthier posture and smoother workflows for heavy phone users.
- Quieter, more professional environment that electronic signaling avoids the audible “clack” of a mechanical lifter, which can be distracting in quiet offices and contact centers.
- Reduced maintenance and downtime with no mechanical lifting mechanism to adjust or replace, the EHS cable offers long-term reliability and fewer support tickets.
- Higher ROI on wireless headsets unlocks the full capabilities of Poly wireless solutions, ensuring organizations get maximum value from their headset investment.
| Manufacturer | Poly |
|---|---|
| Manufacturer Part Number | 85Q60AA, 38439-11 |
| Product Name | HP Poly APP-51 Electronic Hook Switch Cable |
| Product Type | EHS Adapter |
| Function | Provides remote desk phone call control (answer/end) from compatible wireless headsets |
| Device supported | Desk phone + wireless headset (phone cable accessory) |
| Color | Black |
| Cable type | Proprietary EHS interface cable (phone-side plug + headset-base plug) |
| Main use | Electronic off-hook/on-hook signaling; eliminates need for mechanical HL10 handset lifter |
| Headset compatibility | Poly CS500 Series (e.g., CS540, CS510, CS520, CS530 and -XD variants); Poly Savi Series (710/720/730/740/745 and newer 7210, 7220, 7310, 7320, 8210, 8220, 8240, 8245 incl. -M variants); Poly Voyager Office Series (4210, 4220, 4245, 5200 when used with Voyager office base); some MDA series bases. |
| Phone compatibility | Poly/Polycom IP desk phones including IP320/321, IP330/331, IP335, IP430, IP450, IP550, IP560, IP650, IP670, VVX Series, CCX Series (and others as listed in vendor compatibility guides). |
| Signaling features | Remote answer/end, ring alert in headset, electronic hookswitch control |
| Replacement info | Replaces APS-50 EHS cable; compatible with Poly/Plantronics on-line indicator accessory |
| TAA status | TAA-compliant variant for government/regulated procurement |
Frequently Asked Questions
HP Poly APP-51 Electronic Hook Switch Cable (85Q60AA, 38439-11) | Like New
What does an EHS cable do?
What problem does APP-51 solve vs. a handset lifter?
Is APP-51 the same as APS-50?
Which desk phones is it intended for?
Will it work with non-Poly desk phones?
Which headset families commonly use APP-51?
Does it let me answer calls when I’m away from the desk?
Does it support ring alerts in the headset?
What is the “Online Indicator” and why does it matter?
Is this the same as Poly part number 38439-11?
Do I need software to use APP-51?
Is installation difficult?
Can I keep my handset connected too?
Does it improve audio quality?
Is APP-51 TAA compliant?
Is it compatible with specific Polycom phone series?
What’s included in the box?
What color is the cable?
What’s the best way to avoid ordering the wrong EHS cable?
When should I choose APP-51 over other Poly EHS cables?
HP Poly APP-51 Electronic Hook Switch Cable (85Q60AA, 38439-11) | Like New
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