This corpus comprises 14,011 entries uttered by 850 speakers of different dialects, ages and various educational levels (420 males and 430 females), recorded over 2 channels (Mic1: SHURE SM58; Mic2: Labtec Axis-002). The database comprises 104,750 sentences per channel. Speech samples are stored as a sequence of 16-bit 44.1kHz WAV for 150 hours of speech per channel. The total capacity of the data is 88 Gb. 600 speakers read 120 sentences and 250 speakers read 131 sentences. 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.