ISDN Configuration Overview

To configure ISDN interfaces:

1. Order an ISDN line from your telecommunications service provider. Contact your service provider for more information.
2. Configure at least one ISDN interface (physical interface). See ISDN.
3. Configure at least one dialer interface (logical interface). See Understanding Dialer Interfaces.

4. Configure one of the following backup methods on each dialer interface:

   • Configure dial backup if you want to use ISDN to backup the primary device interfaces. See ISDN.
   • Configure dialer filters for dial-on-demand routing backup. You can configure dial-on-demand routing with or without OSPF support. See Understanding Dial-on-Demand Routing Backup.
   • Configure dialer watch. See Understanding Dialer Watch.
   • Configure dial-in or callback. See Understanding Dial-in and Callback.

   Note: You can only configure one backup method per dialer interface.

5. (Optional) Configure bandwidth on demand. See Understanding Bandwidth on Demand.

Related Topics

• Junos OS Feature Support Reference for SRX Series and J Series Devices
• Configuring ISDN Services Physical and Logical Interface Properties in the Junos Network Interfaces Configuration Guide