California Educational Data Processing Association
The DataBus - Vol. 36, No. 5
The Cisco 1000 series routers through the Cisco 7000 series routers have extensive ISDN debug features. The appropriate one for this case is:
debug isdn q931
Remember to use: "term mon" if you telnet to the router. The key error message which you will be looking for is:
Requested Facility Not Subscribed
This will occur at each call attempt. While an incorrect SPID is not the only cause for this error message, it is probably the most common.
Remember to use: "undebug all" when you finish testing.
The Cisco 750/760 series report whether the SPIDs were accepted when they initialize the ISDN line.
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