While all the above applies to the ISDN world, you can also apply some specific tests when encountering ISDN-connected Cisco boxes.
Whenever you find a Cisco router connected to the Internet, private IP networks, PSTN, ISDN, or X.25, the following specific commands (along with, of course, show config or show run and the always useful commands such as show ip route, show cdp neig, and so on) help you get a bigger picture of the ISDN:
• show isdn history
In this way, you may be able to obtain the ISDN number for the machine you are testing, discover more hosts to which the machine is talking via ISDN, and so on.
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