@zaphodb we created the OCTOI (Osmocom Community TDMoIP) network some time ago where you can use ISDN peripherals remotely all year long and connect to hosted services and peers around the globe: https://osmocom.org/projects/octoi/wiki/Community_TDMSS7_Network - you need an E1 capable PBX and an icE1usb at your end, see https://osmocom.org/projects/octoi/wiki/Getting_Started #retronetworking