DinstarGateway

The Dinstar DAG Series FXO Analog VoIP Gateways connect conventional telecom operator phone lines or analogue PBXs with IP telephony networks; they handle 4, 8, and 16 FXO ports.
https://morguefile.com/creative/Dinstagateway
https://pixabay.com/images/id-7644706/
https://unsplash.com/photos/rbdIdnSSbbM
https://www.deviantart.com/voipgateway/art/Dinstar-fxo-voip-gateway-940353713
https://imgur.com/gallery/VbxBthS