Poly M22 Vista Amplifier

(31 customer reviews)


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Poly M22 Desk phone Amplifier (Poly 43596-64 or HP 85T20AA#AC3)

  • Used with Poly (formerly Plantronics) H-Series headsets
  • Speaker and microphone volume adjustments
  • AA battery powered (A/C adapter sold separately)
  • Quick-Disconnect lets you unplug and walk away
  • Same Day Shipping On In Stock Items
  • Warranty 2-Years
  • Fresh Batteries
  • Latest Date Codes
Featured Videos
Why You Need The Plantronics M22 Amplifier? For Compatibility and Quality!
Plantronics Training Video M22

Poly M22 Vista Amplifier for H-Series Headsets – Poly 43596-64 or HP 85T20AA#AC3

Ideal for professionals the Poly M22 deskphone amplifier part # Poly 43596-64 or HP 85T20AA#AC3delivers precise levels of listening comfort, sophisticated hearing protection, and superior audio performance. The Vista M22 includes Clearline audio to improve call quality in any environment, especially wideband VoIP.

The amplifier includes near-universal compatibility with single and multi-line telephones, as well as ergonomically designed volume, headset/handset and mute controls. The Quick Disconnect feature between the amplifier and headset lets you move away from your phone without removing your headset or disconnecting the call.

The Poly M22 Vista amplifier comes complete with a lightweight 10-foot coil cord for freedom of movement at your desk.

Poly M22 Vista Amplifier Features:

  • The Poly (formerly Plantronics) M22 amplifier provides your best possible sound quality
  • Great sound lowers listening errors, repeats, and listener fatigue
  • Compatibility slide switch makes it work quickly with most phones
  • Built-to-last provides a great return on your investment
  • Coiled cable extends to give you 8-10 feet of reach
  • Speaker volume dial to adjust your caller’s voice volume
  • Microphone volume control so callers hear you perfectly
  • Mute button to quickly shut off your mic for co-worker interactions
  • Quick Disconnect allows you to easily disconnect from headset
  • 2 AA batteries last for years – Optional A/C adapter sold separately
  • FREE pair of AA batteries included
  • FREE technical support with purchase
  • Telephone cable, headset cable, battery, and side cover included
  • Need help?  Call us and talk to a Real Person!

Poly M22 Vista Amplifier Specifications:

  • Wideband audio. When used with wideband VoIP system, the Vista M22 delivers enhanced audio and more natural speech.
  • Loud noise protection. Reduces the level of incoming loud noises, such as fax tones or whistle blasts.
  • Advanced echo management. Helps reduce echo often associated with VoIP telephony.
  • Background noise reduction. Reduces the level of background noise picked up by the headset microphone, improving call quality.
  • Call volume equalizer. Maintains user-selectable listening preferences regardless of the quality of the incoming call.
  • Warranty: Two Years for Unsurpassed Durability
  • Volume Control: Speaker and Microphone
  • Mute Control: Push Button
  • Power: 2 AA Batteries (Optional A/C Power Adapter Sold Separately)
  • Compatibility: Any Poly/Plantronics H-Series Headset
  • Model: M22
  • POLY
    • SKU: 43596-64
      • formerly 43596-40
    • UPC: 017229124868
  • HP
    • SKU: 85T20AA#AC3
    • UPC: 197497579833

Amplifier Switch Setting Info:

1 = Very old phones (known as carbon phones – batteries not needed)
2 = AT&T Merlin
3 = AT&T Merlin
4 = Electret test setting (typically not usable)
5 = Most standard phones and default setting (batteries installed)
6 = Avaya Definity
7 = Cisco

Poly M22 Desk phone Amplifier Insider Info:


When we demo any H-series headset, we always use the M22 Vista amplifier in lieu of a Direct Connect cable.  The reason is an amplifier will be compatible with almost any phone, and it gives you complete volume control.  Most phones have a speaker adjustment, but few, if any, have microphone volume control.  With the M22 you control everything, so you and your caller hear each other perfectly.

The M22 amplifier also uses a compatibility switch so it’s quick and easy to find a setting to make your system work.  This is especially useful for users that travel and plug into multiple telephones.

Have you ever had to interact with a co-worker and find yourself constantly trying to cover the mouthpiece of your handset?  With the M22 amplifier, you have a mute button to take care of this problem, and it completely shuts off the microphone so you’ll have complete confidence your caller won’t hear your conversation.

The M22 uses two AA batteries for power that will last for years.  It’s also good to know that as the batteries become weak, you will hear beeps in your headset to indicate a battery change is needed.  You’ll have days, if not weeks, to replace the batteries and will only notice a slight decrease in quality.


When using the M22 amplifier on older phones, you will plug the telephone cable (or pig-tail cable) into where your handset plugs into your phone.  This typically means you will remove the handset from your phone to use your headset, and place the handset back in the cradle to hang up calls.

On newer phones with a headset port, you will use this port and typically push the ringing line or a headset button to initiate and terminate calls.  Install 2 AA batteries in the side compartment (+ facing outward on the top battery and – facing outward on the bottom battery) and slide the battery cover into place.

Next start with the compatibility switch (located on the side) on setting 5, which is the most universal.

Plug your headset into the M22’s coiled cable at the Quick Disconnect connection and lift your handset (on older phones) or press an available line on newer phones.  You should have a dial tone.  If not, slide the compatibility switch to the other numbers labeled 1-6, using the white pick tool located on the bottom of the M22 amplifier, until you have a dial tone.

Once you have a dial tone, call a co-worker and adjust your microphone volume.

Once the compatibility switch and microphone volume settings are complete, slide the included cover over them to ensure they’re not accidentally changed.  You are now set for years of use with your Poly M22 Vista amplifier.

Plantronics M22 Vista Batteries & Switch Settings


When cleaning your Poly/Plantronics M22 amplifier, always use non-alcohol chemicals or wipes.  Using alcohol-based products over time will break down the cords making them very stiff and clumsy to use.  You will want to wipe all plastic components and cables, but avoid saturating any openings where electronic components are in close proximity.

For the M22 amplifier, this will include around the speaker volume dial and other buttons located on the top of the amplifier.  An old toothbrush works very well to clean dust build up from the groves in the casing.

When cleaning your M22 amplifier, also avoid sticking anything into the end of the Quick-Disconnect connection where the four metal contacts are located.  This connection is made to last, and more damage than good will come if you try to clean it.


The M22 amplifier is used by business professionals that require the best possible audio sound quality.  It’s compatible with most phones, making your life much easier, versus using a Direct Connect cable, which requires determining compatibility and then hoping the volumes are adequate.

Additional information for the Poly M22 Vista Amplifier




Desk Phone


Poly 43596-64, HP 85T20AA#AC3


Poly 017229124868, HP 197497579833


Same Day Shipping On In Stock Items





31 reviews for Poly M22 Vista Amplifier | Poly 43596-64 or HP 85T20AA#AC3

  1. Peggy L (verified owner)

    It works great

  2. Craig R (verified owner)

    I bought 4 headsets for a call center at work. I didn’t have everything I needed and Wayne B. talked me through the additional items I needed. He searched to find a product that could be overnighted. It all arrived the next day and set up was super easy. Wayne B. sent me an email and offered help if i needed help to set the equipment up. The equipment works great and the customer service was fantastic.

  3. Tamara M (verified owner)

    The amplifier is easy to use and makes using the headset so easy.

  4. Steve R (verified owner)

    Nice all purpose headset….does the job.

  5. NWPa

    They Just Work. We have several that have been “on the job” for years and still working great.

  6. BERG

    needs some adjusting, but works. wish I had maybe gotten a “unplugged version” as it have alot of cords on my desk already, however it does seem easy to use, I am still making adjustments to the set for voice volume and hearing volume, I thik it is better now, a few more days and I will have this…really helpful to my shoulder and neck muscles!

  7. Gwen

    Excellent Customer Service. I have tried several headsets for a call center and there was a problem with all of them. It is a small room, so we were getting background noise and problems with the caller hearing us. I have searched all over and the reason I purchased these was “Wayne.” I searched and found this company and then called and he answered the phone, I explained the situation and he directed me to what I needed to purchase. I only purchased one set to make sure they were going to work. I called him a couple of times with questions and he was always great to answer and guide me with all of my questions. I placed an order with “Wayne” yesterday to replace all of our headsets. The product is great but the customer service “Wayne” was the best. Thanks again for all of your help.

  8. Cindy R

    Works Great!

  9. Tom G

    Now I can adjust the volume of my voice for the listener as well as the volume of the caller’s voice– GREAT!

  10. Lisa B

    It was easy to set up and the controls are easy to see; easy to use.

  11. Mike L

    Product works very well

  12. DWG

    Amplifier works well. It should be more clear that a power supply does not come with it. Day to day batteries don’t cut it, and I had to pay frieght to get the supply later.

  13. Ruth M.

    Works great with our phone system.

  14. BigSky

    Increases functionality of headset, easy to use and important complement to my set-up.

  15. Carrie

    Had an older set, and this works just as good as that one.

  16. Barb

    This item is everything it’s reported to be.

  17. jdog

    Have used one since 2007, but it needed a replacement. The new one is clearer and rather stylish on the desk.

  18. Maria J

    FYI – I purchased this amplifer for the above noted phones with headsets, and the amplifiers only work if you purchase an additional cable. We opted to send the units back and I’m rating these as 5 stars because of the prompt customer service I received. The service was excellent – would recommend this company to anyone. Thank you Headsets Direct.

  19. Jan

    All seems to work great. Easy to hook up!

  20. Kerri

    Our company has used these amplifiers for years and have never had any issues.

  21. Lael

    I purchased this item along with a simple $20 phone. It works well and the mute button is a plus. I am able to hear the caller well, a little buzz in the background, but that may be due to my cheap phone. I would recommend purchasing it from Headsets Direct; awesome company plus you can’t beat the guarantee.

  22. Tammy

    The amplifier is great; helps with hearing those calls that would be difficult if the amp wasn’t available. The design is stylish.

  23. kmhaas

    Easy to use.

  24. bev

    love it

  25. Rick

    This new one works GREAT, installed EASY and SUPERB service.

  26. Margie

    I was a little tiffed when I found out my Plantronics Starset headset could not plug directly into my new office telephone set. I needed to purchase an adapter. I didn’t know which adapter so I called Headsets Direct and spoke to Wayne Baumgartner. Wayne told me I needed the Plantronics M22, I made the order over the phone. I received the adapter in a matter of a couple of days! This adapter is great. It was easy to set up, and even easier to use. I am now one happy camper. Thanks Wayne!

  27. edwithasled

    I first acquired the M22 unit several years ago, and it worked fine until a leaky battery (not a cheap one either) took it out. I checked other possibilities, but at least for hard-wired units this appeared to be the best. My new M22 works just like the old one, which is to say just fine. Useful volume control, easy install, and looks OK. Note: we lost another M22 to leaking battery. Even after careful cleaning and retouching a couple of solder joints, neither of the M22 units came back to life. So, check the battery conditions once in a while.

  28. David

    I originally purchased my Plantronics headset with the the quick disconnect cable for my Aastra phone , but found that I couldn’t place my calls on mute. So after researching it further, I found I needed the M22 Vista Amplifier. After installing it my headset was finally working as expected.

  29. La Estrella

    I bought the amplifier so that i can use a headset at work. I thought it was going to be hard to connect and use but it actually was very easy to install and the instructions were easy to follow.

  30. NWPa

    We have had several of these in the office for years. They have proven to be very dependable and provide good sound quality to both users.

  31. Jeff

    I needed a solution for my company phone instead of the traditional shoulder phone rest. I had a head set from a previous employer but it did not work with new employer’s phone model. Locating the website was a snap with the phones model number. I was able to pinpoint the exact amplifier match for my phone and for my existing headset. The detail provided about the amplifier gave me confidence in my purchase and prepared me for what to expect in the operation of the amplifier and it’s connection to my headset and phone.
    Very pleased with everything – Thank you

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