You can use SecureCAPI to cryptify your ISDN connections. It can be used to secure both voice and data connections. SecureCAPI accesses the driver of any ISDN cards. To build up cryptify connections, both stations have to be equipped with the SecureCAPI. Any commercial available ISDN applications can be used, without any further requirements or special functions. Application examples: Online banking via cryptified ISDN connections, Secure ISDN Data transfer (e.g. with Fritz!Data), Bugproof telephone calls (e.g. with Fritz!Fon oder Phoner). Please ask your Bank if they already offer a SecureCAPI access.