OP appears to have attempted it. “ One issue is that the protocol for wifi calling is notoriously opaque. Carriers frequently change the underlying infrastruct

OP appears to have attempted it. “ One issue is that the protocol for wifi calling is notoriously opaque. Carriers frequently change the underlying infrastructure and protocol details. Also, the protocol assumes terrestrial broadband with reasonable latency and bandwidth. At McMurdo, as of this writing, latency to terrestrial locations is in excess of 700 milliseconds. Usable bandwidth for any given end user can vary widely, down to a few dozen kilobits per second. The protocol also doesn’t expose any useful diagnostic info to the end user in order to troubleshoot. You just have to cross your fingers that the magic “wifi calling” icon lights up.”