Using a Microphone to Speak on the Phone.
You can use the ECO's internal microphone, a Bluetooth headset microphone, or both, to speak on the phone if you are able to do this.
Using a Microphone
There is a Microphone option in the Phone Configuration menu. Use the arrow keys to select the option you want—Built-in; BT Headset or Built-in & Headset.
Adjust the Mic Level option to make the volume louder or softer. Remember, if the volume is too loud, you will hear feedback noise.
You can use your CORE overlay whether the microphone is on or not.
Note: to connect with Bluetooth headphones/headset go to the Toolbox, select the FEEDBACK MENU and then select the Bluetooth Speaker Menu option.