This corpus comprises 3,085 entries uttered by 265 speakers of different dialects, ages and various educational levels (134 males and 131 females), recorded over the mobile telephone network. The database comprises 6,972 Chinese stocks. Speech samples are stored as a sequence of 16-bit 8kHz WAV for a total of 7 hours of speech. The total capacity of the data is 387 Mb. Each speaker read 15-30 items. Text files are stored in Unicode format. All data have been proofread manually. The transcriptions include non-speech markers (background noise, background speech, speaker sounds) as well as markers for mispronunciation, channel distortions, words left-out and duplicates. The corpus aims to be applied to the testing and telephone natural speech recognition system.