The Twin database named TWINDB1 includes recordings of 45 French speakers, consisting of 9 pairs of identical twins (8 males and 10 females) with similar voices, and 27 other speakers (13 males and 14 females) including 4 none-twin siblings. Each twin or sibling spoke for a total of 24 to 30 minutes in three sessions conducted with at least one week interval between sessions. In each session subjects were asked to read three different texts of one page. These texts consists of one paragraph of about 10 lines extracted from the journal SVM Mac July 1994, some short phrases, digits, credit card numbers, etc. extracted from the Polyphone French database corpus. The speakers called from their office or from their home. Subjects were recorded over the telephone using an OROS AU32 PC-board at 16 bits linear form, 8KHz sampling frequency.