350-801 CLCOR: Implementing and Operating Cisco Collaboration Core TechnologiesDemo

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QuestionQ153

Voice Gateways and Session Border Controllers

An engineer is troubleshooting an outbound-call failure on an ISDN-PRI circuit and suspects the error “Incompatible Destination.” Which debugs or commands should be run on the voice gateway to investigate the issue?

  • A debug isdn q921debug voip ccapi inout
  • B debug voip ccapi inoutshow controller t1
  • C debug isdn q931show isdn status
  • D debug isdn q921term mon
Explanation

ISDN cause information such as “Incompatible Destination” is carried in Q.931 call-control signaling. debug isdn q931 displays the Q.931 setup and disconnect messages, including cause values, while show isdn status confirms the PRI’s ISDN Layer 1, Layer 2, and Layer 3 status.

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