Finally got my Raspberry Pi 3 all configured to replace my old outdated power-hog Pentium 4 dial-up server. It’s running Raspbian Buster, with mgetty configured to answer the modems. I have a multi-port USB>RS232 adapter that the 4x 56k USR Modems are connected to. The Pi and RS232 adapter are both mounted on the plywood shop wall. My Avaya Definity PBX provides the dialtone and ringing, there’s a hunt group to dial into for all the modems.
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