No one wants their office to seem like a high school cafeteria where people have to yell across the room to get the attention of someone else. That makes it very difficult for anyone to get their work done and it gives a bad impression to outsiders.
So in your office space layout, make sure to include telephones for each desk and/or workstation within the office. You should have an inter-office phone system set up so that employees can make internal calls to one another. This will eliminate the yelling as well as employees walking from one end of the office to the other just to ask a simple question.
By providing each employee with a phone at their desk, workstation or cubicle, they will be able to do their jobs more efficiently. It will also save everyone the headaches that are sure to result from multiple conversations competing with one another across the office.