Amazon.com: ctia omtp adapter
https://www.amazon.com/ctia-omtp-adapter/s?k=ctia+omtp+adapter
1-16 of 156 results for "ctia omtp adapter". Skip to main search results. Universal 3.5mm CTIA to OMTP Earphone Converter Adapter(1piece). 2.8 out of 5 stars 32.
Open Mobile Terminal Platform - Wikipedia
https://en.wikipedia.org/wiki/Open_Mobile_Terminal_Platform
The Open Mobile Terminal Platform (OMTP) was a forum created by mobile network operators to discuss standards with manufacturers of mobile phones and other mobile devices. During its lifetime, the OMTP included manufacturers such as Huawei, LG Electronics, Motorola, Nokia...