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ISDN and DDR

ISDN and DDR. Objectives. ISDN concepts ISDN configuration DDR configuration. Digital Communication with ISDN. ISDN Benefits. ISDN Standards. ISDN Access Options. ISDN 3-Layer Model. Q.931 Messaging-Call Setup Example. Call Processing.

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ISDN and DDR

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  1. ISDN and DDR

  2. Objectives • ISDN concepts • ISDN configuration • DDR configuration

  3. Digital Communication with ISDN

  4. ISDN Benefits

  5. ISDN Standards

  6. ISDN Access Options

  7. ISDN 3-Layer Model

  8. Q.931 Messaging-Call Setup Example

  9. Call Processing • The D channel is used to send the called number to the local ISDN switch. • The local switch uses the SS7 signaling protocol to set up a path and pass the called number to the remote ISDN switch. • The remote ISDN switch signals the destination over the D channel. • The destination ISDN NT-1 device sends the remote ISDN switch a call-connect message. • The remote ISDN switch uses SS7 to send a call-connect message to the local switch. • 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.

  10. ISDN Functions and Reference Points

  11. ISDN Functions and Reference Points

  12. BRI Reference Points

  13. Cisco ISDN BRI Interfaces

  14. S/T ISDN Interface U ISDN Interface ISDN Interfaces

  15. ISDN Switch Types

  16. Configuring ISDN BRI

  17. Configuring ISDN BRI

  18. Configuring ISDN PRI

  19. Switch Types Available for ISDN PRI Configuration

  20. ISDN PRI Examples

  21. Verifying ISDN Configuration

  22. Troubleshooting ISDN Configuration

  23. DDR Operation

  24. DDR Operation

  25. Configuring Legacy DDR

  26. 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

  27. Specifying Interesting Traffic – Dialer List

  28. Configuring Dialer Information – PPP

  29. The dialer-group Command

  30. The dialer-map Command

  31. The dialer idle-timeout Command

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

  33. Dialer Profile Elements

  34. Configuring Dialer Interfaces

  35. Verifying DDR • show dialer • show dialer interface [BRI] • show isdn active • show isdn status

  36. Troubleshooting DDR • debug isdn q921 • debug isdn q931 • debug dialer [events|packets] • isdn call interface • clear interface bri

  37. Dialer Profiles

  38. 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

  39. Rotary Groups

  40. 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

  41. Dialer profiles

  42. 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 …

  43. Labs

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