One way audio issues, especially intermittent can be tricky to diagnose.
It’s typically your router / firewall and/or the ISP that can cause issues with the real time audio stream (RTP) packets getting blocked or messed up.
I’m not sure about your ATA but on some Cisco phones, like my 9971’s you can log into via their web portal and check the inbound and outbound RTP stats whilst a call is in progress. This will give you some confidence that this could be the issue.



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