Mitel 50004197 5425 Line Interface Module

The Mitel 50004197 5425 Line Interface Module is a discrete plug-in component designed to deliver analog line survivability and local PSTN access for compatible Mitel IP phones. By connecting directly to the back of a supported handset, the module provides a seamless fallback path to a traditional analog PSTN circuit in the event of an IP network disruption, ensuring that voice communications remain available even during outages. This makes it a practical, low-cost disaster recovery and business continuity solution for converged, mission-critical deployments where uninterrupted telephony is required. The module also supports localized calling and emergency dialing for remote users, addressing both everyday operational needs and critical safety requirements.

Key features & benefits

• Automatic PSTN Failover — When IP service is disrupted, voice communication automatically and transparently defaults to the connected analog PSTN line, allowing users to continue making and receiving calls without manual intervention.
• Analog Line Connectivity — Provides a dedicated, separate connection to an analog telephone line, including lines that carry bundled DSL service, bridging the gap between legacy PSTN infrastructure and modern IP telephony environments.
• Emergency Dialing Support — Ensures that emergency services remain accessible regardless of IP network status, a critical capability for organizations with regulatory or safety obligations around 911 and emergency call routing.
• Localized Calling for Remote Users — Enables remote and branch-office users to access local PSTN calling and emergency services through the module, reducing dependence on centralized IP infrastructure for day-to-day and critical calls.
• Disaster Recovery by Design — Engineered as a low-cost survivability component for mission-critical converged environments, the module minimizes the risk of total communications loss during network failures or IP service interruptions.
• Simple Plug-In Installation — The module connects directly to the back of supported Mitel IP phones, allowing for straightforward deployment without additional hardware, wiring infrastructure, or complex configuration.