We have an NEC PBX system - NEAX 2400 IPX. Of late calls from cell phones to our phone system tend to be inaudible on our side. Our PBX engineer had us reset the last card prtb – pri. That has not resolved the issue.
Is this just a matter of old technology not keeping up with the newer technology of today's cell phones and the networks they use? Or is there something we can do with the system we have to resolve the issue?