Table Of Contents
ISDN BRI Line Configuration Requirements
ISDN BRI Provisioning by Switch Type
Defining ISDN Service Profile Identifiers
Dial-on-Demand Routing Over ISDN
Bandwidth on Demand and Dial Backup over ISDN
Configuring the ISDN Line
This appendix describes how to order and configure an Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) line for use with a Cisco 1600 series router with an ISDN BRI interface or a Cisco 1600 series router with an ISDN BRI WAN interface card installed.
This appendix contains the following sections:
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ISDN BRI Line Configuration Requirements
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ISDN BRI Line Configuration Requirements
Before using a Cisco 1600 series router with an ISDN BRI interface or a Cisco 1600 series router with an ISDN BRI WAN interface card installed, you must order a correctly configured ISDN BRI line from your local telecommunications service provider.
This process varies significantly from provider to provider on a national and international basis. However, following are some general guidelines:
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ISDN BRI Switch Types
ISDN BRI supports a variety of service provider switches. lists, by geographic areas, the ISDN switch types supported by the Cisco 1600 series routers ISDN BRI interface. When configuring the router, use the isdn switch-type command followed by the corresponding keyword.
ISDN BRI Provisioning by Switch Type
The ISDN BRI line is configured (provisioned) for different types of services by the ISDN BRI service provider. The person ordering the ISDN line must also order the provisioning described in this section.
Table B-2 lists the provisioning that should be ordered for the router, based on the switch type.
Defining ISDN Service Profile Identifiers
An ISDN service provider, usually a telephone company, can offer a variety of services. Many providers use service profile identifiers (SPIDs) to identify the device that is using the ISDN service, similar to the way that the telephone company uses a telephone number to identify your standard telephone service. If you use a service provider that requires SPIDs, the provider assigns your ISDN device one or more SPIDs when you first subscribe to the service. Providers use different numbering schemes, but a SPID is usually a seven-digit telephone number, plus some optional numbers. The provider also assigns your device one or two local directory numbers (LDNs), which function as the router telephone numbers. The LDN is the number that a remote router dials to make a call to the router.
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When your ISDN device accesses the switch to initialize the connection, first it must send any assigned SPID(s) to the service provider. Otherwise, your ISDN device cannot place or receive calls. Use the isdn spid command to define the SPID and the LDN on the router for both ISDN BRI B channels, as follows:
Router(config-if)# isdn spid1 spid-number [ldn]Router(config-if)# isdn spid2 spid-number [ldn]
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ISDN Configuration Options
For information on how to configure Cisco 1600 series routers to dial into a central site router over ISDN, refer to the Cisco 1600 Series Software Configuration Guide that came with your router.
For more advanced information on configuring ISDN for Cisco 1600 series routers, refer to the chapter "Configuring ISDN" in the Wide-Area Networking Configuration Guide publication, which is on the Documentation CD-ROM that came with your router. This document includes the information on the following topics:
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Snapshot Routing over ISDN
You can also configure snapshot routing for the router ISDN interface. Snapshot routing is a method of learning remote routes dynamically and keeping the routes available for a specified period of time, even though routing updates are not exchanged during that period. See the chapter "Configuring DDR" in the Wide-Area Networking Configuration Guide publication for detailed information about snapshot routing.
Dial-on-Demand Routing Over ISDN
To place calls on the ISDN interface, you must configure it with dial-on-demand routing (DDR). See the chapter "Configuring DDR" in the Wide-Area Networking Configuration Guide publication for detailed information about DDR.
Bandwidth on Demand and Dial Backup over ISDN
See the chapter "Configuring DDR" in the Wide-Area Networking Configuration Guide publication for detailed information about bandwidth on demand and dial backup.
