The converged system connects to the Public Switched Telephone Network (PSTN) via analog trunk lines. Several users have complained that when making a call the system intermittently does not complete or drops the calls to external numbers. Which of the foll owing are the MOST likely causes of the issue?

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The converged system connects to the Public Switched Telephone Network (PSTN) via analog trunk lines. Several users have complained that when making a call the system intermittently does not complete or drops the calls to external numbers. Which of the foll owing are the MOST likely causes of the issue?