The Cisco NIM-2FXSP/4FXOP is a Network Interface Module designed for Cisco integrated services routers, providing 2 FXS (Foreign Exchange Station) ports and 4 FXO (Foreign Exchange Office) ports. This combination module enables analog telephony connectivity, supporting both station-side and office-side interfaces for legacy POTS integration into modern VoIP networks. The module fits standard NIM form factor slots on compatible Cisco platforms including ISR G2 and ISR 4000 series routers. It supports standard analog signaling protocols and works within Cisco Unified Communications ecosystems for branch office voice deployment, call center integration, or hybrid analog-to-digital migration scenarios. Typical applications include connecting traditional analog phone lines and fax systems to enterprise voice networks, enabling gradual transition from circuit-switched to packet-switched infrastructure.
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