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1© 2003, Cisco Systems, Inc. All rights reserved.
CCNA 4 v3.0 Module 4ISDN and DDR
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Objectives
• ISDN concepts
• ISDN configuration
• DDR configuration
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333© 2003, Cisco Systems, Inc. All rights reserved.
Digital Communication with ISDN
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ISDN Benefits
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ISDN Standards
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ISDN Access Options
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ISDN 3-Layer Model
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Q.931 Messaging-Call Setup Example
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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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262626© 2003, Cisco Systems, Inc. All rights reserved.
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
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Configuring Dialer Information - PPP
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292929© 2003, Cisco Systems, Inc. All rights reserved.
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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333333© 2003, Cisco Systems, Inc. All rights reserved.
Dialer Profile Elements
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343434© 2003, Cisco Systems, Inc. All rights reserved.
Configuring Dialer Interfaces
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353535© 2003, Cisco Systems, Inc. All rights reserved.
Verifying DDR
• show dialer
• show dialer interface [BRI]
• show isdn active
• show isdn status
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363636© 2003, Cisco Systems, Inc. All rights reserved.
Troubleshooting DDR
• debug isdn q921
• debug isdn q931
• debug dialer [events|packets]
• isdn call interface
• clear interface bri