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CCNA 4 v3.1 Module 4

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CCNA 4 v3.0 Module 4ISDN and DDR

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Objectives

• ISDN concepts• ISDN configuration• DDR configuration

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Digital Communication with ISDN

555

ISDN Benefits

666

ISDN Standards

777

ISDN Access Options

888

ISDN 3-Layer Model

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Q.931 Messaging-Call Setup Example

101010

Call Processing

1. The D channel is used to send the called number to the local ISDN switch.

2. The local switch uses the SS7 signaling protocol to set up a path and pass the called number to the remote ISDN switch.

3. The remote ISDN switch signals the destination over the D channel.

4. The destination ISDN NT-1 device sends the remote ISDN switch a call-connect message.

5. The remote ISDN switch uses SS7 to send a call-connect message to the local switch.

6. The local ISDN switch connects one B channel end-to-end, leaving the other B channel available for a new conversation or data transfer. Both B channels can be used simultaneously.

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ISDN Functions and Reference Points

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ISDN Functions and Reference Points

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BRI Reference Points

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Cisco ISDN BRI Interfaces

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ISDN Interfaces

S/T ISDN Interface

U ISDN Interface

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ISDN Switch Types

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Configuring ISDN BRI

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Configuring ISDN BRI

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Configuring ISDN PRI

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Switch Types Available for ISDN PRI Configuration

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ISDN PRI Examples

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Verifying ISDN Configuration

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Troubleshooting ISDN Configuration

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DDR Operation

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DDR Operation

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Configuring Legacy DDR

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Defining Static Routes

• When configuring static routes, consider the following:

By default, a static route will take precedence over a dynamic route because of its lower administrative distance. Without additional configuration, a dynamic route to a network will be ignored if a static route is present in the routing table for the same network.

To reduce the number of static route entries, define a summarized or default static route

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Specifying Interesting Traffic – Dialer List

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Configuring Dialer Information – PPP

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The dialer-group Command

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The dialer-map Command

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The dialer idle-timeout Command

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Dialer Profiles Overview• Define encapsulation and access control lists• Determine minimum or maximum calls• Turn features on or off

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Dialer Profile Elements

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Configuring Dialer Interfaces

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Verifying DDR

• show dialer

• show dialer interface [BRI]

• show isdn active

• show isdn status

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Troubleshooting DDR

• debug isdn q921

• debug isdn q931

• debug dialer [events|packets]

• isdn call interface

• clear interface bri