Hi
@ThomB_3CX, same issue on our end.
Following devices DO NOT allow taking on calls with the multifunction button on our Shokz OpenRun headsets. These devices also DO NOT show "Bluetooth/Telecom" toggle in the Advanced menu.
- Samsung Galaxy Tab A8, OneUI 5.0 (Android 13), 3cx 18.1.3.135
- Nothing Phone 1, Nothing OS 1.5.2 (Android 13), 3cx 18.1.3.135
Following device does work correctly, also showing the "Bluetooth/Telecom" toggle.
- Samsung S21, OneUI 5.1 (Android 13), 3cx 18.1.3.135
We have a few more Samsung and Lenovo tablets but haven't tested on those (yet).
Symptoms vary by device.
- The Galaxy Tabs do initiate bluetooth bidirectional when ringing starts, but pushing the button stops bluetooth bidirectionaloutput and 3CX audio output is set to tablet speakers.
- The Nothing Phone doesn't initiate bluetooth bidirectional at all. (Unsurprising, this OS is very similar to Oppo/OnePlus)
- The Samsung S21 can accept calls with the button, but ending the call with button DOES NOT work.
The workaround is answering the call on the device itself, followed by toggling the speaker icon to "Bluetooth".
Eventually a minor manual operation, but very annoying to do for every call.