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QuestionQ382

Voice Gateways and Session Border Controllers

An engineer is troubleshooting a Primary Rate Interface that will not come up on an H.323 production voice gateway. Layer 1 and Layer 2 configurations have been successfully validated. Which Cisco IOS command must be run to debug the issue with the least impact on network performance?

  • A debug vtsp session
  • B debug ccsip messages
  • C debug all
  • D debug isdn q931
Explanation

ISDN Q.931 is the Layer 3 signaling protocol used for PRI call control. debug isdn q931 displays the Layer 3 call setup and teardown messages needed to diagnose a PRI issue after Layers 1 and 2 have been confirmed, while avoiding the broad, potentially disruptive output of debug all.

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