Configuring ISDN Interfaces

ISDN is a set of standards for digital transmission over different media created by the Consultative Committee for International Telegraphy and Telephony (CCITT) and the International Telecommunication Union (ITU). ISDN is a dial-on-demand service that provides fast call setup, low latency, and the ability to carry high-quality voice, data, and video transmissions. ISDN is also a circuit-switched service that can be used on both multipoint and point-to-point connections.

You configure two types of interfaces for ISDN service: a physical interface and a logical interface called the dialer interface.

Four types of Physical Interface Modules (PIMs) provide ISDN connectivity on J-series Services Routers:

• 1-port S/T interface supporting ITU-T I.430, ETSI TS 101080, and GR-1089-Core Type III
• 1-port U interface supporting ANSI T.601 and GR-1089-Core
• 4-port S/T interface supporting ITU-T I.430, ETSI TS 101080, and GR-1089-Core Type III as a field-replaceable unit (FRU)
• 4-port U interface supporting ANSI T.601 and GR-1089-Core

For information about installing hardware, see the J-series Services Router Getting Started Guide.

For information about installing ISDN service over an ISDN line, contact your telecommunications service provider.

To configure ISDN services physical interface properties, include the isdn-options statement at the [edit interfaces br-pim/0/port] hierarchy level:

[edit interfaces br-pim/0/port]

    isdn-options {

        calling-number number;

        incoming-called-number number <reject>;

        pool pool-name <priority priority>;

        spid1 spid-string;

        spid2 spid-string;

        static-tei-val value;

        switch-type (att5e | etsi | ni1 | ntdms100 | ntt); 

        t310 seconds;

        tei-option (first-call | power-up);

    }

    dialer-options {

        pool pool-name <priority priority>;

    }

}

To configure ISDN services logical interface properties, include the following statements:

[edit interfaces dln unit logical-unit-number]

    dialer-options { 

        activation-delay seconds;

        callback;

        callback-wait-period time;

        deactivation-delay seconds;

        dial-string dial-string-numbers;

        idle-timeout seconds;

        incoming-map {

            caller caller-id) | accept-all;

        {

        initial-route-check seconds;

        load-interval seconds;

        load-threshold percent;

        pool pool-name; 

        redial-delay time;

        watch-list {

            [ routes ];

        }

    }

    encapsulation [

        (cisco-hdlc | multilink-ppp | ppp);

    }

}

To configure a primary interface to use an ISDN logical interface as a backup or "failover" interface when the primary connection experiences interruptions in Internet connectivity, include the backup-options statement to specify the ISDN interface at the [edit interfaces interface-name unit logical-unit-number] hierarchy level:

[edit interfaces interface-name unit logical-unit-number]

    backup-options {

        interface dln.0;

    }

}

You can include these statements at the following hierarchy levels:

• [edit interfaces]
• [edit logical-routers logical-router-name interfaces]

To configure the Services Router to reject incoming ISDN calls (supported when dial-in is configured), include the reject-incoming statement at the [edit system processes isdn-signaling] hierarchy level:

[edit system processes isdn-signaling]

reject-incoming;

{

To disable ISDN, include the disable statement at the [edit system processes isdn-signaling] hierarchy level:

[edit system processes isdn-signaling]

disable;

{

To disable the dial-out on demand process, include the disable statement at the [edit system processes dialer-services] hierarchy level:

[edit system processes dialer-services]

disable;

{

This chapter discusses configuration of the following ISDN interface properties:

• Configuring ISDN Physical Interface Properties
• Configuring ISDN Logical Interface Properties
• Disabling ISDN Processes