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210-060 · Question #102

An engineer receives an isolated report that the customer can make calls successfully from an IP phone to other IP phones, but receives an error recording when attempting to call someone over the…

The correct answer is C. Test the call using Dialed Number Analyzer in Cisco Unified Communications Manager D. Check the calling search space used by the line on the IP phone in Cisco Unified. When PSTN calls fail from an IP phone, verifying the calling search space and using Dialed Number Analyzer are the correct first steps to identify routing and permission issues in CUCM.

Maintenance and Troubleshooting

Question

An engineer receives an isolated report that the customer can make calls successfully from an IP phone to other IP phones, but receives an error recording when attempting to call someone over the PSTN. The user cannot recall the error recording to provide the specific error message. Which two steps should the network engineer take to begin troubleshooting? (Choose two.)

Options

  • AEnable debug isdn q931 on the gateway and have user make the same call from the IP phone to
  • BCheck the region used by the IP phone in Cisco Unified Communications Manager.
  • CTest the call using Dialed Number Analyzer in Cisco Unified Communications Manager
  • DCheck the calling search space used by the line on the IP phone in Cisco Unified
  • ECheck the gateway to determine which codec is being used by the appropriate dial peer.

How the community answered

(36 responses)
  • A
    8% (3)
  • B
    3% (1)
  • C
    78% (28)
  • E
    11% (4)

Why each option

When PSTN calls fail from an IP phone, verifying the calling search space and using Dialed Number Analyzer are the correct first steps to identify routing and permission issues in CUCM.

AEnable debug isdn q931 on the gateway and have user make the same call from the IP phone to

Enabling debug isdn q931 requires reproducing the call at the gateway and is appropriate only after CUCM routing has been confirmed correct, making it a later-stage step.

BCheck the region used by the IP phone in Cisco Unified Communications Manager.

Regions control audio codec and bandwidth between devices and are not a factor in whether calls can be routed to the PSTN.

CTest the call using Dialed Number Analyzer in Cisco Unified Communications ManagerCorrect

The Dialed Number Analyzer (DNA) in CUCM simulates a call to trace route patterns and determine whether the dialed digits match a valid route pattern to the PSTN, making it ideal when the user cannot recall the error message. It provides a full trace of which CSS, partition, and route pattern would be selected without requiring the user to reproduce the live call.

DCheck the calling search space used by the line on the IP phone in Cisco UnifiedCorrect

The Calling Search Space (CSS) assigned to the phone line determines which partitions and route patterns are accessible; a misconfigured or missing CSS would prevent the phone from matching any PSTN route pattern, directly causing the reported failure.

ECheck the gateway to determine which codec is being used by the appropriate dial peer.

Codec selection by a dial peer is a media negotiation concern and would not cause the call to fail before reaching the gateway.

Concept tested: CUCM calling search space and Dialed Number Analyzer for PSTN troubleshooting

Source: https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/213349-understand-calling-search-spaces-and-par.html

Topics

#PSTN calls#calling search space#Dialed Number Analyzer#troubleshooting

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