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Chapter 6. Using ISDN and DDR Technologies to Enhance Remote Connectivity

This chapter covers the following topics:

• ISDN Overview

• DDR

• The ISDN Layer Protocols

• Examining ISDN Call Setup and Teardown

• Configuring ISDN

This chapter provides an overview of Integrated Services Digital Network (ISDN). The first part of this chapter covers a limited amount of theory necessary for sufficient understanding of the ISDN configuration, verification, and troubleshooting of a Cisco Network Access Server (NAS) that follows.

Included in this discussion of ISDN are its advantages over other types of connections, services it can offer, available bandwidth in the form of BRI and PRI, and dial-on-demand routing. When it comes to ISDN, it is also important to comprehend the interface to the service provider cloud as well as circuit-switched access establishment via call setup and its release via call teardown.

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