Swissphone utilizes the IDEA standard, originally developed at ETH Zurich.
The storm outside was interfering with the IP-based internal radio system. The PA crackled and died. The landline on his desk was dead—likely a tree branch on the lines outside. Swissphone Psw900 Idea
The most radical aspect of the PSW900 Idea is backward compatibility. The device supports DMR (Digital Mobile Radio) paging. Why? Because when a hurricane takes down cell towers, or a chemical plant explosion overloads commercial bandwidth, the narrowband paging network (often run by fire departments or utilities) still works. Swissphone utilizes the IDEA standard