It's a conflict that's familiar to Michael Cunningham, a high school speech and debate teacher at Del Valle High School in Del Valle, Tex., outside Austin. Mr. Cunningham runs the Skype Foreign Language Lab, a program that allows students around the world to talk with one another via computers and headsets using the free VoIP phone service Skype. He began the exchange in 2002 with three schools; this fall, the network will have 47 schools in seven countries. The program is interdisciplinary; last year, some Del Valle students were assigned phone pals in France, Italy and Turkey to practice foreign languages, while others participated in mock parliamentary debates.