Cisco 1721 Access Router Hardware Installation Guide - Ordering and Configuring an ISDN Line [Cisco 1700 Series Modular Access Routers]

Table Of Contents

Ordering and Configuring an ISDN Line

ISDN BRI Line Configuration Requirements

ISDN BRI Switch Types

ISDN BRI Provisioning by Switch Type

Defining ISDN Service Profile Identifiers

ISDN Configuration Options

Snapshot Routing

Dial-on-Demand Routing

Bandwidth on Demand and Dial Backup

Ordering and Configuring an ISDN Line

This appendix tells how to order and configure an Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) line for use with a Cisco 1721 router with an ISDN BRI WIC installed.

This appendix contains the following sections:

•ISDN BRI Line Configuration Requirements

•ISDN BRI Switch Types

•ISDN BRI Provisioning by Switch Type

•Defining ISDN Service Profile Identifiers

•ISDN Configuration Options

ISDN BRI Line Configuration Requirements

Before using a Cisco 1721 router with an ISDN BRI WIC installed, you must order a correctly configured ISDN BRI line from your local telecommunications service provider.

This process varies dramatically from provider to provider, both nationally and internationally. However, the following are some general guidelines:

•Ask for two channels to be called by one number.

•Ask for delivery of calling-line identification. This is also known as caller ID or automatic number identification (ANI).

•If the router is going to be the only device attached to the ISDN BRI line, ask for point-to-point service and a data-only line.

•If you will be connecting another ISDN device (such as an ISDN telephone) to the ISDN BRI line, ask for point-to-multipoint service (subaddressing is required) and a voice-and-data line.

ISDN BRI Switch Types

ISDN BRI supports a variety of service provider switches. Table D-1 lists, by geographic area, the ISDN switch types supported by a Cisco 1721 router ISDN BRI interface. Use the isdn switch-type command followed by the corresponding keyword. You must reboot the router after you enter this command in order for the change to take effect.

Table D-1 ISDN Switch Types Supported by the Cisco 1721 Router

Switch Type

Keyword

Australia

TS013 switches

basic-ts013

Europe

German 1TR6 switches

basic-1tr6

Norway NET3 switches (phase 1)

basic-nwnet3

NET3 ISDN switches (UK and others)

basic-net3

VN2 ISDN switches

vn2

VN3 ISDN switches

vn3

Japan

NTT switches

ntt

North America

Basic 5ESS switches

basic-5ess

NT DMS-100 and 5ESS custom switches

basic-dms100

National ISDN-1(NI1) or switches

basic-ni

New Zealand

Net3 switches

basic-nznet3

ISDN BRI Provisioning by Switch Type

The ISDN BRI line is configured (or 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 D-2 lists the provisioning that should be ordered for the router, based on the switch type.

Table D-2 Provisioning Required for ISDN Switch Types

Switch Type

Provisioning

5ESS Custom BRI

For data only

Two B channels for data.
Point to point.
Terminal type = E.
One directory number (DN) assigned by service provider.
MTERM = 1.
Request delivery of calling line ID on Centrex lines.
Set speed for ISDN calls to 56 kbps outside local exchange.

5ESS Custom BRI

For voice and data

(Use these values only if you have an ISDN telephone connected.)
Two B channels for voice or data.
Multipoint.
Terminal type = D.
Two directory numbers assigned by service provider.
Two service profile identifiers (SPIDs) required, assigned by service provider.
MTERM = 2.
Number of call appearances = 1.
Display = no.
Ringing/idle call appearances = idle.
Autohold = no.
Onetouch = no.
Request delivery of calling line ID on Centrex lines.
Set speed for ISDN calls to 56 kbps outside local exchange.
Directory number 1 can hunt to directory number 2.

5ESS National ISDN (NI1) BRI

Terminal type = A.
Two B channels for voice and data.
Two directory numbers assigned by service provider.
Two SPIDs required; assigned by service provider.
Set speed for ISDN calls to 56 kbps outside local exchange.
Directory number 1 can hunt to directory number 2.

DMS-100 BRI

Two B channels for voice and data.
Two directory numbers assigned by service provider.
Two SPIDs required; assigned by service provider.
Functional signaling.
Dynamic terminal endpoint identifier (TEI) assignment.
Maximum number of keys = 64.
Release key = no, or key number = no.
Ringing indicator = no.
EKTS = no.
PVC = 2.
Request delivery of calling line ID on Centrex lines.
Set speed for ISDN calls to 56 kbps outside local exchange.
Directory number 1 can hunt to directory number 2.

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 such a service provider, 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 number. The LDN is the number that a remote router dials to make a call to your router.

Note SPIDs have significance only at the local-access ISDN interface. Every router that uses ISDN must be assigned SPIDs (if used by the service provider) by the service provider for that router.

When the router connects to the service provider's central office ISDN switch, it sends the SPIDs to the switch. If the router is not configured with the correct SPIDs, it 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]
Note Although the LDN is usually optional, it might be required so that the router answers calls made to the second directory number.

ISDN Configuration Options

For information on how to configure Cisco 1721 router to dial in to a central-site router over ISDN, refer to the Cisco 1700 Router Software Configuration Guide.

For more advanced information on configuring ISDN for Cisco 1700 routers, refer to the chapter "Configuring ISDN" in the Dial Solutions Configuration Guide, which is on the Documentation CD-ROM that came with your router. This document includes information on the following topics:

•Snapshot Routing

•Dial-on-Demand Routing

•Bandwidth on Demand and Dial Backup

Snapshot Routing

You can configure snapshot routing for the router ISDN interface. During snapshot routing, the router is configured to bring up the ISDN line, to dynamically learn about remote routes, and then to take down the ISDN line. The router saves the learned routes for a specified period of time, even though routing updates are not exchanged while the ISDN line is down. See the chapter "Configuring DDR" in the Wide-Area Networking Configuration Guide for detailed information about snapshot routing.

Dial-on-Demand Routing

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 for detailed information about DDR.

Bandwidth on Demand and Dial Backup

See the chapter "Configuring DDR" in the Wide-Area Networking Configuration Guide for detailed information about bandwidth on demand and dial backup.