FWIW I agree with buckbova and don't think its overboard in the slightest to ask for personal calls to be made out of the office. Nor do I think it unreasonable for this to be part of the company culture. It happens to be part of how we work in the startup I work at (except the desk phone on silent thing) and I'm not aware of any problems this has caused. So I find your pronouncement that its not "reasonable" to be a bit presumptuous.
Agreed. I wish my company was more like that. I don't want to hear you arguing with your wife, making a doctor's appointment to get that lump checked out, or trying to convince your kids to do their homework while you're at the office.