I would guess the server is run by the voip provider in Stockholm, which literally seems to be 1-3 contractors. Reading between the lines of the few articles published about the call center it seems like their business idea is to hire old nurses and not pay them very much.
https://www.voiceintegrate.com/se/support/vi-som-jobbar-h%C3...
Their business idea was to handle calls that were placed in inconvenient hours, relative to Swedish business hours.
My best guess is that the Thai ISP this office used filtered all outgoing connections except port 80 and 443.
And then someone decided that the way to implement this securely while still allowing this office to access the data was to put a plain HTTP server on port 443. "Who is ever going to crack that?"