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How do I configure an ISDN connection on my Cisco router for Internet connection?

How do I configure an ISDN connection on my Cisco router for Internet connection? What information do I need to know from my ISDN provider? Could you give me a detailed configuration?

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From your service provider, you need to get the switch-type, ISDN number, IP address, subnet mask and default gateway for your router. Also ask them if you need to configure the static route on your router.

A generic BRI configuration is detailed below. But use it with caution until you understand each of the commands.

IP address negotiated (can give the static one also)
encapsulation PPP
ISDN switch-type basic-net3 (check with ISP)
no CDP enable
encapsulation PPP
dialer remote-name ISP
dialer idle-timeout 180
dialer string 1234 (check the string)
PPP authentication chap pap calling
PPP multilink

This was first published in March 2005

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