I knew that I can plug-in a mic to the sound blaster to use the internet phone. But can I use a telephone to dail to a modem(or phone blaster) and that use the internet phone by writing simple program? I think the most difficult part is how to redirect the modem received voice to the Soundcard such that the voice can input to the internet phone. Is there any API(whatever company) or AT command to do this? I've heard that some Rockwell chipset based modem can implement this function, possibly by some AT command. However, I don't know that AT command.