Monday, November 01, 2004
The annoying thing about international phone cards is that the data lines they connect to transmit audio data in half-duplex mode. This means that while you are talking, you will not be able to hear any comments that the other person makes. It is a great way for the international carriers to halve their expenses, since they only need to reserve half the bandwidth for each phone call as they would for full-duplex communication. And of course, this "feature" is not advertised along with the product.
