The SpeechDat Basque MDB database contains the recordings of 600 Basque speakers (287 males, 315 females) collected over the mobile telephone network. The database is partitioned into 4 CD-ROMs, in ISO 9660 format. Speech samples are stored as sequences of 8-bit 8 kHz A-law, uncompressed. Each prompted utterance is stored in a separate file, and each signal file is accompanied by an ASCII SAM label file which contains the relevant descriptive information. Each speaker uttered about 41 items. A pronunciation lexicon with the phonetic transcription in SAMPA is also included.