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A crackling sound is heard on the line during calls

Core Issue

This crackling sound is often caused by the use of a cable that has a poor electrical connection.


Replace the cable to resolve this problem. If replacing the cable does not resolve the problem, perform these steps:

  • Identify and eliminate the electrical interference or faulty power supplies.
  • Identify and eliminate any digital errors occurring on the line. These can be identified on the Cisco IOS  gateways by issuing the the show controller t1/e1 command.
  • Also look for hardware issues, such as failure of the port or controller.

For more sample voice quality symptoms, refer to Recognizing and Categorizing Symptoms of Voice Quality Problems.

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 03:39 PM
Updated by: