Ascom wireless phones—encompassing ruggedized smartphones, VoWiFi handsets, and DECT devices—are engineered specifically for mission-critical industries where communication failure is not an option, such as acute care hospitals, heavy industrial plants, and high-security workplaces. Their high reliability stems from several design choices, including dedicated DECT frequencies that bypass congested Wi-Fi or cellular traffic to eliminate interference, robust Ingress Protection ratings ensuring resistance to dust, water, and harsh chemical disinfectants, and enterprise-grade encryption for secure audio transmission. Additionally, features like hot-swappable batteries, drop-resistant housings, and seamless handover between base stations ensure uninterrupted connectivity while users move across large multi-building facilities. Deployed and trusted by major institutions worldwide, these devices undergo rigorous testing to meet stringent regulatory standards for uptime, redundancy, and durability in uncompromising environments.