This corpus comprises 13,200 Korean digit strings uttered by 110 speakers of different dialects, ages and various educational levels, recorded over 4 channels. Speech samples are stored as a sequence of 16-bit 48kHz WAV for 18.87 hours of speech per channel. The total capacity of the data is 24.2 Gb. Each speaker read 120 items. Text files are stored in Unicode format. All data have been proofread manually. The corpus aims to be applied to the testing and telephone natural speech recognition system.