ISR4431-AX/K9-RF Cisco 4000 Series 4331 3 x onboard WAN or LAN Ports 1000Base-T + 2 x RJ-45 Ports + 2 x SFP Ports Gigabit Ethernet 1U Rack-mountable VoIP Gateways Router

Elevate your enterprise connectivity with the Cisco 4000 Series 4331, a compact 1U rack‑mountable gateway that delivers robust, high‑throughput routing and VoIP capabilities. Designed for demanding environments, it seamlessly integrates with existing infrastructure, providing reliable WAN or LAN connectivity, flexible uplink options, and advanced voice services. The 4331’s intelligent routing engine and secure, scalable architecture ensure uninterrupted communication, while its low‑profile form factor maximizes rack space. Ideal for branch offices, data centers, and service providers, this gateway combines performance, resilience, and ease of deployment to keep your network agile and future‑ready.