I remember that the Sun Microsystems drop in office in SF had a "quiet room" that the developers loved. No phones at the desks, and absolute quiet. But disagreements would break out when the spaces outside were all taken up and sales people needed a seat. Some just yakked. Others brought in cell phones and felt that as long as they used a hushed voice, they were honoring the silence. Other people felt that allowing a cell phone to ring and then taking the call outside the quiet room as you talked counted as quiet.

The office manager ruled with an iron fist, fortunately, and she really didn't care if someone didn't like her, so these folks got the boot. She saved that quiet room, as far as I'm concerned.