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Say for example I have these headphones with microphone - https://www.amazon.com/2019-Stereo-Headphones-Samsung-Galaxy/dp/B07TWB1R8B/

How do I know if the headphone jack is OMTP or CTIA?

And which of the two standards is more common for the modern headphones with mic? Should I buy OMTP or CTIA?

In general, telephones work with both OMTP and CTIA headphones, or with just one of them? Are there any telephones that support both types of headphones?

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According to Linx (a headset expert!), the CTIA standard is used in the USA, Hong Kong and other international markets, while OMTP is used primarily in china. The technical difference is that the ground and mic connections are swapped, with OMTP having the ground connection on the last ring away from the tip.

CTIA plug pin-out

image courtesy of linked site

Reading the questions in the Amazon link provided indicates that the headphones work with Samsung devices, which is referenced in the linked site as well.

If you are USA based, it appears that CTIA is the correct choice.

With respect to your edit and comment, the reversal of the ground and microphone contacts would indicate that only one type of device is going to work with the respective contact configuration. This is not a certainty, but I've not discovered "active discovery" type headphones with microphone connection swapping.

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  • Thanks, I just added to this the question: "In general, telephones work with both OMTP and CTIA headphones, or with just one of them? Are any telephones that support both types of headphones?"
    – Joe Jobs
    Jul 9 at 12:55
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    @JoeJobs I have noticed some work interchangeably, but I don't believe that's intentional... Jul 11 at 6:14

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