An engineer troubleshoots an outbound call failure on an ISDN-PRI circuit. The engineer is suspecting the error “Incompatible Destination”. Which debugs or commands are run in the voice gateway to troubleshoot the issue?
C is correct, there is no "Incompatible destination" error message in q921
https://www.cisco.com/c/en/us/support/docs/dial-access/integrated-services-digital-networks-isdn-channel-associated-signaling-cas/8607-isdn-disc-code.html
so it is not useful a q921 debugs, it is to debug D-channel and debug voip ccapi inout is to debug call control API, not ISDN.
The question begin wit a suspect of the engineer and they must confirm that suspect, and the way to confirm that is debug isdn q931.
Using the debug voip ccapi inout command you get the following Call informations in detail, like Calling Number, Called Number,
Incoming Dial-peer, Outgoing Dial-peer, Trunk group lables, ANI (A Number CLI), ANI type and also the CAUSE VALUE.
This Cause Value well help you to identify the reason for call drop
So it is A. ccapi will help to understand error
However, q921 does not make a Layer 3 problem. Also, the debug voip ccapi inout EXEC command is to trace the execution path through the call control API, so it is not so useful to trace a ISDN call
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