Is it possible to organize VOIP within the local network between internal numbers?

Question

VoIP

Hello! Once again, when moving part of the office to another block of the building, the question arose - are there "simple" means to reshape internal subscriber lines (10-12 analog) into ip and then back to analog on the spot? Maybe there are some converters or something like that? I would like to reduce the number of cables in the channels, and so there are already deposits of carrion for decades of the building's operation as an office.

Answer 1

As far as I understand you need FXS/SIP and FXO/SIP gateways.
I did not implement such a scheme, but the SIP-Analog phone scheme works with a bang.