Change default audio option in Teams Meeting

Is there a way to change the default audio option for teams meetings to the dial-in option instead of computer audio? We have external users who join the meeting not realizing that their computer audio is selected by default. They then call in using the phone number provided and have now joined the meeting twice.

The audio options are not very prominent and it's a pain trying to explain to users that they need to change this option every time we have a meeting.

Thanks for your help.