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sounds like its a naming problem, if two or more devices on your network have the same ip address it will cause intermitent connectivity. if this is not the case then you should contact manufacturer to see if there are any problems which they are aware of involving this problem.
check your firewall settings add in allow list pop 3 port 110 in allow list both inbound and out bound.then save router settings .
u have to allow port 110 in allow list.check also windows firewall or antivirus settings.
I gather you are using an IP phone. I would have to say that the only way to trouble shoot is to use a protocol analyzer. If you connect it within the IP path you will be able to see both ends of the call and determine if the call was received or not and if the other end is responding to your call. Your IP PBX might be the problem I would run a diagnostic on it and if it fails, I would suggest calling the manufacture to see if there are any tests you can run.
alwayes start chcking a problem from the end and back
1) check the MIC on your handset - connect it to something else and see if it works good...
2) check your output if there is any noise (voltage, other system....)
if all is good then the problem is probeply in your COMP:
check all audio configurations
if that didnt help then its a hardware problem....