... components in an ISDN network • Configure ISDN BRI and legacy dial-on-demand routing (DDR) • Verify DDR operation using show and debug commands 32 ... completion of this chapter, you will be able to perform the following tasks: • Describe the components that make up ISDN connectivity • Configure ISDN BRI and legacy dial-on-demand routing (DDR) • ... Voice, data, video, and special services ISDN Standards Issue Protocol Telephone Network and ISDN ISDN Concepts, Aspects, and Interfaces Switching and Signaling Key Examples E-Series E.163—International...