ISDN Switches¶

ISDN Switches (or ISDN exchanges) were digital telephony exchanges supporting the ISDN protocol.

All major manufacturers of telephony switching equipment produced ISDN-capable switches at some point. In Germany, Alcaltel S12 and Siemens EWSD were the two widely deployed ISDN switches.

• Alcatel System 12
• Siemens EWSD
  • EWSD Architecture
  • EWSD Hacks
    • EWSD SCSI drive emulation