Cisco NIM-4E/M= 4-Port E/M Network Interface Module | Voice, ISR

Add dedicated E&M voice interfaces to Cisco 4000 Series Integrated Services Routers with a module designed for branch deployments that still depend on analog signaling. The NIM-4E/M= increases port density without consuming a full chassis slot, giving infrastructure teams a practical way to extend voice connectivity inside the router platform they already standardize on. Built for Cisco 4000 Series ISRs, this 4-port module supports online insertion and removal, which helps reduce downtime during upgrades or replacements. That matters when voice services are tied to operational continuity and maintenance windows are tight. The module’s compact footprint and 0.44 lb approximate weight make it easy to integrate into distributed sites where space and serviceability both matter. For organizations modernizing at the edge, the NIM-4E/M= provides a controlled path to preserve legacy voice interfaces while keeping the routing platform aligned with current network architecture. It is a focused, purpose-built option for teams that need reliable E&M connectivity rather than a generic expansion card.