pamela.woods

I have a VoipBuster SIP account that I am trying to use through a softphone on my new MacBook (Mac OS X 10.5.6). I managed to get Express Talk installed and registered with my VoipBusters account, but when I try to call a land-line, there is no audio being transferred in either direction. I called myself, and the phone rings, but I don't hear anything through the phone, nor can I hear anything through the computer when speaking. My microphone is working and nothing is muted. Any ideas?