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Good day. Thank you for the question.
For connection to FMB001, you may use a wireless microphone that supports Bluetooth 3.0 functionality and connect with FMB001. So when you need to hear the sound in the vehicle, you may call to the device and it will Auto Answer, allowing you to hear the sound in the cabin.
For Hands Free Call Settings > Auto Answer, refer here https://wiki.teltonika-gps.com/view/FMB001_SMS/Call_settings#Incoming_Call_settings
For Bluetooth Connection, refer here https://wiki.teltonika-gps.com/view/FMB001_Bluetooth_settings
Please try this out and let me know if it helps.
Is there some teltonica device for passanger car to worck with analog wired mic?