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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.
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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.

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My comment provides the solution to my problem.
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My comment provides the solution to my problem.

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We have an NEC PBX system - NEAX 2400 IPX. &nbsp;Of late calls from cell phones to our phone system tend to be inaudible on our side. &nbsp;Our PBX engineer had us reset the last card prtb – pri. &nbsp;That has not resolved the issue.<br />
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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? &nbsp;Or is there something we can do with the system we have to resolve the issue?
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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?

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

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.