Etebac 1: used for the transfer of information from the Client to the Bank, through a switched telephone (STN). Client to Bank is mainly used by the Client company to transmit operations to be executed by its banker: it is termed the Transmission (Sending).

Etebac 2: used for the transfer of information from the Bank to the Client, through a switched telephone (STN). Bank to Client is mainly used to transmit both accounting and pending information related to the account: it is termed the Reception (Return).

These two protocols, Etebac 1 and 2, are at the present time completely obsolete.