ISDN and DDR

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ISDN and DDR
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Objectives

• ISDN concepts
• ISDN configuration
• DDR configuration

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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
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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 eventspackets
• isdn call interface
• clear interface bri

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Dialer Profiles
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Dialer profiles

• Legacy DDR powerful but can restrict growth
• Based on static binding between destination call
  specification a physical interface
• Locks physical interface into one configuration
• dialer command configured on physical interface
• Rotary groups
• Single logical configuration from the dialer
  interface to multiple physical interfaces
• Dialer profiles
• Dialer profiles propagate logical
  configurations from multiple dialer interfaces to
  a physical interface, as needed much more
  flexibilty

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Rotary Groups
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Dialer Profiles

• With dialer profiles, the logical and physical
  configurations are dynamically bound to each
  other on a per-call basis.
• This allows physical interfaces to dynamically
  assume different characteristics based on
  incoming or outgoing calls, as shown in Figure
  Next Slide

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Dialer profiles
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Dialer profiles
Interesting traffic
interface dialer 0 ip add 192.168.x.x dialer-group
5 dialer pool 1
interface bri 0
(Physical interface) dialer pool-member 1 encap
ppp ppp authentication pap
dialer pool
dialer-list 5 protocol ip permit
interface dialer 1 ip add 172.16.x.x dialer pool
1 dialer-group 5 dialer string 123 class ABC
interface bri 1
(Physical interface) dialer pool-member 1 encap
ppp ppp authentication pap
map-class dialer ABC dialer idle-timeout 30
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Labs
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Labs