I assume the author meant that since those teams will be speaking a lot to people as part of their daily work they add a lot of ambient noise to a workplace. That could matter to some people in open office plans or cube farms where you can't separate yourself from that noise.

That's it. "Is the office loud" is subjective. "Is there a team handling calls a few metres away" has a simple objective answer... usually.

"will i be listening to people answering the phone all day, every day?"