Methods, systems, and apparatus, including computer programs encoded on a computer-readable storage medium, that include receiving a first audio signal from a first client communication device. A transcription of the first audio signal is then generated. Next, the transcription is translated. Then a second audio signal is generated from the translation. And then the following are communicated to a second client communication device: (i) the first audio signal received from the first device; and (2) the second audio signal generated from the translation of the transcription of the first audio signal received from the first client communication device.