Is PBX on-site or cloud?
What is this simplest thing with problems? For example, if you dial *43 (echo test), can you hear the instructions clearly? Is the echo messed up? Do calls between local extensions have problems? When leaving a voicemail from a local extension, does the greeting sound bad? Does the message left sound bad? If only outside calls are bad, is it the PBX user who can’t hear, the remote party, or both?
What does the ‘top’ command show?
What do your CPU and network usage stats show?
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