Completing ISDN Calls

© 2002, Cisco Systems, Inc. All rights reserved.
Completing ISDN Calls
Module 9
Objectives
Upon completing this module, you will be able to:
Configure ISDN BRI, ISDN PRI, and legacy DDR, given a functioning remote access router and a physical ISDN connection
Use show commands to identify the anomalies in the ISDN BRI, ISDN PRI, and legacy DDR configurations, given a functioning remote access router and a physical ISDN connection
Use debug commands to identify the anomalies in the ISDN BRI, ISDN PRI, and legacy DDR configurations, given a functioning remote access router and a physical ISDN connection
© 2002, Cisco Systems, Inc. All rights reserved.
4
Configuring ISDN BRI and PRI
Objectives
Upon completing this lesson, you will be able to:
Configure ISDN BRI and ISDN PRI, given a functioning router and a physical ISDN connection
Use show commands to identify the anomalies in the ISDN BRI and PRI configurations, given a functioning router and a physical ISDN connection
Use debug commands to identify the anomalies in the ISDN BRI and PRI configurations, given a functioning remote access router and a physical ISDN connection
What Is ISDN?
Voice, data, video, and special services
Standards from the ITU-T (formerly CCITT)
ISDN Standards
BRI and PRI are used globally for ISDN.
ISDN Access Options
BRI and PRI Call Processing
ISDN Functions and Reference Points
Functions are devices or hardware.
Reference points are demarcations or interfaces.
Cisco ISDN BRI Interfaces
Cisco ISDN PRI Interfaces
ISDN Switch Types
Many providers use many different switch types.
Services vary by region and country.
Router(config)#isdn switch-type switch-type
The command specifies the type of ISDN switch with which the router communicates.
Other configuration requirements vary for specific providers.
Step 1: Specify the ISDN switch type.
Router(config-if)#isdn switch-type switch-type
Configuring ISDN BRI
Sets a B channel SPID required by many service providers
Step 2: (Optional) Setting SPIDs
Sets a SPID for the second B channel
Router(config-if)#isdn spid1 spid-number [ldn]
Router(config-if)#isdn spid2 spid-number [ldn]
Configuring ISDN BRI (cont.)
Configuring ISDN PRI
Router(config)#isdn switch-type switch-type
Router(config)#controller controller slot/port
Router(config-controller)#pri-group timeslots range
Step 1: Specify the ISDN switch type.
Step 2: Select the controller.
Step 3: Establish the interface port
to function as PRI .
ISDN PRI Examples
Router(config)#controller T1 3/0
Router(config-controller)#framing esf
Router(config-controller)#linecode b8zs
Router(config-controller)#pri-group timeslots 1-24
 
Router(config-controller)#interface Serial3/0:23
Router(config-if)#isdn switch-type primary-5ess
Router(config-if)#no cdp enable
T1 Sample Configuration
Router(config)#controller E1 3/0
Router(config-controller)# framing crc4
Router(config-controller)# linecode hdb3
Router(config-controller)# pri-group timeslots 1-31
 
Router(config-controller)#interface Serial3/0:15
Router(config-if)# isdn switch-type primary-net5
Router(config-if)# no cdp enable
E1 Sample Configuration
Verifying the ISDN Configuration
Router#show isdn active
Router#show isdn status
Displays current call information
Displays the status of an ISDN connection
Router#show interfaces bri0
Displays statistics for the BRI interface configured on the router
Troubleshooting the ISDN Configuration
Router#debug ppp authentication
Displays the PPP authentication protocol messages
Displays information on PPP link establishment
Router#debug isdn q921
Shows ISDN Layer 2 messages
Shows ISDN call setup and teardown activity (Layer 3)
Router#debug isdn q931
Router#debug ppp negotiation
Displays protocol errors associated with PPP
Router#debug ppp error
Summary
ISDN defines a digital architecture that provides integrated voice and data capability using the public switched network.
ISDN specifies two standard access methods, BRI
and PRI.
To establish an ISDN call, the D channel is used between the routers and switches, and SS7 signaling is used between the switches.
ISDN functions are hardware devices while reference points are interfaces between devices.
Cisco devices can be physically configured with different ISDN options, which dictate what additional equipment, if any, is needed to run ISDN.
Summary (Cont.)
You must configure your router to identify the type of switch it will be communicating with, which depends in part on the country the
switch is in.
To enable ISDN BRI, you use isdn switch-type and isdn spid commands.
To enable ISDN PRI, use the pri-group command.
Use show commands to verify that your ISDN configuration is functioning properly.
You can use debug commands to troubleshoot your ISDN configuration.