Also, if you are a registered owner of Internet Phone, you can join their Addressing service which will allow other registered users to call you directly by using your email address or a special Internet Phone address. If someone calls you, click the Answer button to begin the conversation. There is no need to click on the Push To Talk button to speak when you are in a one on one conversation with someone. Use the Push To Talk button when you want to speak in a Conference room. There are differences in the way you use Internet Phone depending on whether your computer has a half duplex of full duplex sound card.
Full duplex is the preferred method.
You can tell if you are in full duplex mode by looking at the bottom of the Internet Phone. If you think you have a full duplex sound card but you are in half duplex mode, you can change to full duplex by clicking on Options, selecting Audio and then Full Duplex. Speaking with someone if full duplex mode is simple. You just speak as you normally would on a telephone. With half duplex mode, only one person may speak at a time, which means you have to wait until the other person stops speaking before you can start.