This general problem we are also asked every day.
In smaller ///-PBX systems with only analogue lines (PSTN),
we had offered our customers displays showing who has called in , on the analogue lines.
The displays ("show who has called box"are of course different in many countries, but the function is general.
The displays are placed at the operator, or the person that "owns" a direct analogue trunk. Of course the cabling is 2-wires for the digital Ericsson telephone (DTS and OPI) AND 2-wires for the number display.
Normally we recommend ISDN lines.
Best regards from the doktor
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