Configuring ISDN

ISDN connectivity is supported on J Series devices as a backup for a primary Internet connection. J Series devices can be configured to “fail over” to an ISDN interface when the primary connection experiences interruptions in Internet connectivity.

Use ISDN also at the central office to terminate calls that originate at branch office routers and for central office callback for security, accounting, or cost savings at the branch office.

You can use either J-Web Quick Configuration or a configuration editor to configure ISDN BRI interfaces. To configure ISDN PRI, you use either the J-Web configuration editor or CLI configuration editor.

Note: This chapter provides instructions for configuring basic ISDN BRI service and features such as dial backup, dial-in, or callback for both ISDN BRI and ISDN PRI. To configure basic ISDN PRI service, see Configuring Channelized T1/E1/ISDN PRI Interfaces.

For information about which devices support the features documented in this chapter, see the JUNOS Software Feature Support Reference for SRX Series and J Series Devices.

This chapter contains the following topics:

• ISDN Terms
• ISDN Overview
• Before You Begin
• Configuring ISDN BRI Interfaces with Quick Configuration
• Configuring ISDN Interfaces and Features with a Configuration Editor
• Verifying the ISDN Configuration