Troubleshooting PSTN Behaviour by Comparing Call Recordings and Packet Captures

Posted by John Marrett on Apr 11, 2019 11:30:52 AM

Your companies telecommunications are only as good as your voice quality. Without good voice quality... well there's always email.

Sometimes after you've corrected QoS misconfigurations, validated WAN and LAN behavior and validated your fixes you still have user complaints. In this blog post, we dive deep into techniques that allow you to analyze and measure the behavior of the PSTN, beyond your SIP termination points and into the public phone networks. In this specific example even call recordings showed good voice quality. However, we established that the issues were related to call latency. Normally there is no way to measure latency without the use of specialized tooling, but we developed the following technique.

There are a number of factors that contribute to poor voice quality. In this article, we discuss methods to troubleshoot and isolate voice quality issues outside of the network and on the PSTN using packet captures and call recordings. Packet captures are one of the most powerful troubleshooting tools we have.

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Topics: CUCM, Cisco CUCM, packet captures, Voice quality, PSTN

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