Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 320

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?

Answer options

• A. debug isdn q921 debug voip ccapi inout
• B. debug voip ccapi inout show controller t1
• C. debug isdn q931 show isdn status
• D. debug isdn q921 term mon

Correct answer: C

Explanation

The correct answer is C because 'debug isdn q931' is specifically designed to troubleshoot ISDN signaling issues, including compatibility errors with the destination. The other options either do not focus on the appropriate ISDN layer or use commands that are not directly related to the root cause of the issue.