Thanks for reminding me why we should say NO when asked to do residential.
On the other hand, I am starting to encounter small businesses that request/require a system comprised of ONLY portable phones. I try to persuade them to stick with desk MLT's, but they are adamant that the convenience of a portable is what they want.
The perceived convenience is that they can wander around their office, consult with other workers, talk while looking for something in a file cabinet, or while standing at a table, reading a blueprint.
The trend is caused, I think, by the almost universal use these days of cell phones, when they are out of the office, so they want the same "feel" when they are in the office.