I closed the browser after connecting both parties for both users, and the meeting appears to remain running looking at the Meetings dashboard.
I noticed this because after closing the window, I cannot start a new meeting, and I had to go to the meeting dashboard to end the meeting. Then I could start a new meeting.
The error returned is something to do with the network timing out. I don’t get the option to end the other meeting in progress or anything that tells me there’s another meeting preventing this one from starting.