Telcos the world over have been desperate to retire ancient circuit switched infrastructures and migrate their ageing fixed voice calling services to the broadband networks now accessed by nearly all their customers. This has met resistance not so much ironically on the voice front but through various legacy data services that are hitched to the technical idiosyncrasies of the PSTN (Public Switched Telephone Network). This includes fax machines, old telephony PBX switches, emergency services, telecare, home security alarms, payment terminals and monitoring systems, developed when the PSTN was the only remote communications option and also provided power in the event of a mains’ failure. Devices in these categories were either installed by service providers or purchased by consumers, raising slightly…