Apple Compatible Earphone Adapter for Landline Telephones (CTIA 4-PIN TRRS 3.5mm to 2.5mm 3-PIN TRS)

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Model AH2P • Earphone Adapter for Use with Office and Home Landline Telephones

Your Apple Compatible Earphone will now be able to Plug into a Landline Desk Telephone or Home Portable Cordless Phone if it has a 2.5mm headset Jack. After the iPhone 7 Apple cell phones, they did away with the wired plug in jack, however many people still have the original earphones that have an inline microphone. We also sell many different wired earphones that are compatible with the AH2P adapter. If you have a set of the original Apple earphones that came with your iPhone, they still can be put to use with most desk phone or cordless portable phones to communicate without having to hold the phone.

  • The AH2P Adapter has a female jack that accepts AHJ and CTIA compatible earphone headsets
  • The female jack accepts a 4-pin TRRS 3.5mm male plug with a 14 inch cable and the opposite end plug has a 3-conductor TRS male 2.5mm plug that will fit most home and office landline phones
  • The AH2P adapter will enable your iPhone compatible earphone to connect with most home or office phones that have a 2.5mm jack
  • We developed this adapter to allow direct connection from existing iPhone compatible wired earphones so they can plug into the 2.5mm jack found on many home phones and cordless telephones
  • Most iPhone compatible earphones will allow you to speak over a landline phone with this special audio adapter
  • Compatible with CTIA (Apple Headset Jack) standard earphone headsets with a built-in microphone and 4-conductor TRRS plug
  • Many gaming headsets used with Playstation are also CTIA configured headsets, so they can also be adapted for use with a landline phone if you purchase the AH2P adapter 

Shown Below is a Photo of the AH2P Adapter Plugged into a 2.5mm Portable Telephone Jack

AH2P Plugged into Portable Phone

The AH2P adapter will enable you to connect any of our (Apple compatible) earphones to your desk telephone or cordless landline telephone. The Apple Headset Jack (AHJ) is CTIA compatible. Most earphones and headsets manufactured today using the AHJ CTIA (Apple compatible) standard. Using the AH2P adapter, an earphone or headphone with a built-in microphone will be able to use the AH2P adapter to make phone calls, hearing the conversation in your earpiece and speak into the microphone.

If you have a wired earphone that has a built-in mike, and you want to use that with your desk telephone or cordless telephone, this adapter will accept the 4-conductor 3.5mm male plug of your earphone and it is comes with a 14-inch long cable. The AH2P has a 3.5mm female jack and the adapter goes between your earphones and the telephone 2.5mm jack. The Apple-compatible earphones have a built-in microphone and a 4-conductor TRRS Apple configuration plug. If your earphones work with Apple iPhones or the iPhone standard, then this adapter should enable you to plug them into your telephone jack.

NOTE: Most earphones with built-in mike were made to work with the Apple iPhone standard. These include all the earphones offered by our company. Any earphones that are made to connect with the older Samsung (OTMP) standard configuration will not work with the AH2P adapter becaise the Samsung (OTMP) configuration plugs use a reverse of the microphone and ground wiriring within the plug. This diagram shows the AH2P adapter and a plug that fits inside the female jack.

Customer feedback is often a significant factor when it comes to the things that we develop at Scan Sound. Customers had been ordering some of our adapters and when questioning them why they ordered a particular adapter, we found many were trying to come up with a way to use their cell phone earphone with their home or office telephone. We did some checking and tinkered around with the phone connections and found that we were able to come up with an adapter that seems to do the trick. Keep in mind that this adapter has connections that are made to work with iPhone compatible earphones. The iPhone earphones have an inline microphone and a 4-conductor TRRS plug using the AHJ connections standard. The iPhone compatible earphones will make the correct connections so the earphone hears the audio and the microphone can be heard over the phone to communicate with a home or office telephones that has a 2.5mm jack.

We have been using one of these adapters now for some time with our Scan Sound earphones and they work well with most home and office telephones that have the 2.5mm jack. They connect very well with our phones so that we can converse hands-free with customers when the phone rings. You just plug your headset into the adapter, and then plug the other end of the adapter into the 2.5mm jack of your telephone. That's all there is to it. Then when you want to initiate a call, you simply click on the talk feature on your phone and dial the person you want to speak with. Similarly, you can answer the phone by touching the talk button. You may have to get used to the earpiece being situated in your ear, but it is certainly a lot more comfortable than holding the telephone to your ear all day long.

Many office and home telephones have a headset jack. On the cordless portable phones, the jack may be hidden by a rubber cover. The 2.5mm plug size is smaller than the standard stereo earphones plugs. Our AH2P adapter accepts your earphone plug and the adapter 2.5mm plug goes into the jack that looks like a very small hole in the phone. The earphones with an inline microphone will have a 4-conductor 3.5mm plug that is CTIA compatible. You may hear many buzzwords being used such as CTIA and AHJ howver, just keep in mind that they are all telling you that they used the same standard as the Apple earphone configured plugs. Due to the large numbers of wired earphones and headsets sold by Apple, the CTIA and AHJ configurations have become fairly standard with most audio products.

The AH2P adapter is compatible with most phones that have a built-in headset jack, similar to the models shown below:

Desktop Telephones Thumbnail Image    Portable Cordless Telephone with 2.5mm Plug

Country of Manufacture
Jack Type
3.5mm 4-Cond
Plug Type
2.5mm 3-Cond
Plug Plating
Plug Style
Slim Straight
Cord Length
14 inches
  • Marco Nerone

    28th Jul 2021

    Earphone Adapter for Landline Telephones (CTIA 4-PIN TRRS 3.5mm to 2.5mm 3-PIN TRS)

    The product appears to be okay, although there may be connectivity issues at times.

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