Cisco SM-X-72FXS is a 72-port FXS (Foreign Exchange Station) service module designed for Cisco ASR 9000 series routers. The double-wide module form factor enables high-density voice termination in carrier and enterprise environments. Each FXS port supports standard analog telephone connectivity, making this module ideal for legacy POTS integration, VoIP gateway applications, and voice service consolidation. The module integrates seamlessly with ASR 9000 line cards via standard service module slots, delivering distributed voice processing at the edge. Typical deployments include carrier access networks, enterprise unified communications gateways, and service provider VoIP platforms requiring analog phone line support. All units tested and guaranteed; available via quote.