This corpus comprises 1,500 entries uttered by 120 speakers of different dialects, ages and various educational levels (59 males and 61 females), recorded through head-mounted noise-canceling microphone. The database comprises 3,600 digit strings. Speech samples are stored as a sequence of 16-bit 22.05kHz WAV for a total of 6.2 hours of speech. The total capacity of the data is 945 Mb. Each speaker read 120-150 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.