The at work phone voice is the voice that people affect when they answer phones and have to be nice to the people calling, usually with a scripted response, such as:

Thank you for calling Cubicle Farm X, this is Jen...?

I have been doing some form of computer support or another since I was 19, and my phone voice has slipped its way into my personal life as well. Not a 6 month period goes by that I don't answer my home phone with some corporate jingle and then become so nauseated that I just hang up on whoever called me. People seem to think they got the wrong number. Fine by me.

I think the most annoying thing about the at work phone voice is that it develops its own cadence - check out the movie Office Space and listen to the chick from corporate accounts payable - she's got a good beat and you can dance to it. I hate hearing myself do that.