I'm going to point out to my co-worker that we should've moved to another part of the office because of the person that was working.
Why do you want to move?
They speak too loud on the phone.
It can be really frustrating to work near someone who is louder than necessary. Is it too late to move?
Yeah, can't move now.
The best thing to do is to politely ask the person to lower their voice a little as it is cutting into your phone calls and confusing the customer.