noisehound

I don't think I've ever heard someone say that at the start of a phone call but it's common when communicating with two-way radios like:

"Alex for John, over"

"Go for John, over"

""

I mostly heard that when working in large retail stores, usually the walkie talkies have an end-transmission sound que so we didn't actually have to say 'over' at the end

You would have won if you went bottom left and then center