During the past week, I've used Yahoo! Messenger's PC-to-phone service a few times to call a regular phone from my PC. Today, I made a call which was answered by an automated system and I was prompted to respond to questions by hitting a number. You know the routine, right?
Of course, I had to hang up and use a regular phone, since there's no way to provide such responses. The keypad on the computer keyboard had no interaction with the PC-to-phone software once a connection is made with a phone.
I'm sure there's no way around this. Just thought I mention it in case anyone has used another PC-to-phone service, such as Skype, and can actually do this.