Well, I'd never be able to find the people who implemented the open floor plan. That's one of the problems with huge companies - the guilty are to often anonymous ;-)
The problem with the sales person is that there are room set aside for making phone calls (whether personal or business) and there are always some available, but apparently that is entirely too unreasonable to expect someone with a laptop to go find a room instead of letting everyone in a 30 foot radius listen in on the call.
Good question. In the past we've had some issues with this, and it's possible to mildly influence volume and "out in public" call frequency downward by asking. But it requires a combination of a thick hide and some institutional status to make it happen. If the person you are asking is a peer or a senior, forget it.
It's not that simple. She has been around a long time and even though she isn't a manager, seniority goes a long way at my company. My manager has mentioned it to her, but realistically that's as far as he can take it.
Ask for a place farther from her, perhaps switching with some other talkative colleague in a better spot. If manager rises eyebrows, argue that she is too loud and inconsiderate(unscrupulous) to other people. Even better if more colleagues share this view, make a move together.
The problem with the sales person is that there are room set aside for making phone calls (whether personal or business) and there are always some available, but apparently that is entirely too unreasonable to expect someone with a laptop to go find a room instead of letting everyone in a 30 foot radius listen in on the call.