If you want to come across better on conference calls, you might considering buying a “sales mirror” for you desk. These are the mirrors that call center employees often put on their desks to ensure that they’re smiling when they’re talking to customers.
The idea is that the smile on your face is reflected in your voice.
Here’s an advertisement for a “PC Mirror” that you can attach to your computer. The ad claims that these mirrors increase sales among call center employees from six to 16 percent.
I can’t vouch for the accuracy of their study. But I do believe that on conference calls people can hear your smile.