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Calls from cell phones can't be heard within NEC PBX system

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?
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Sounds like you'll have to call your local NEC technician. For the most part, as far as the system is concerned, there should not be any difference whether a cell phone or landline is calling. There's nothing different by the time it gets to your system over the PRI.
NCHCITAuthor Commented:
It turns out our phone carrier did not have echo cancellation turned on.
NCHCITAuthor Commented:
My comment provides the solution to my problem.
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