'Is there a standard bluetooth profile for an external cell phone ringer device (not a full external speaker/mic)?
Is there a standard bluetooth profile for an external cell phone ringer device? For example if I wanted to build a device (from an ESP32 for example) that would connect to a cell phone via bluetooth and just amplify the ringer, is there a standard bluetooth profile for this or would a separate app be required? The external device would not have a mic/speaker the phone would be used directly once the call was picked up.
If the answer depends upon the phone, then I'm looking for Android answers.
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