Cisco 4331-AX/K9 Integrated Services Router

Introduction

The Cisco 4331-AX/K9 Integrated Services Router is a powerful, scalable, and flexible solution designed to meet the growing demands of small and medium enterprises, branch offices, and distributed businesses.
This router is a key component in Cisco’s ISR 4000 Series, offering a perfect blend of performance, security, and adaptability.

With upgradable throughput from 100 Mbps up to 300 Mbps, the 4331 lets you grow and adjust your network capabilities without needing to buy a new router.
This makes it a cost-effective and future-proof solution for companies experiencing ongoing expansion and changing business needs.

Reliable Performance for Your Business Operations

The Cisco 4331 delivers high performance and strong resiliency to handle a range of enterprise workloads — from data, voice, and video — all on a single platform.
It is designed to handle concurrent services, which means you can activate advanced capabilities — like VPN, routing, and application optimization — without affecting forward performance.

Running Cisco IOS XE, the 4331 lets you deploy services quickly and efficiently, thanks to its programmable architecture and flexible software packages.
This makes it a perfect match for businesses looking to consolidate their operations into a unified, multitasking router.

Security and VPN Support

For businesses that require a secure enterprise network, the Cisco 4331 comes with extensive VPN capabilities, including IPsec, GRE, and DMVPN.
It also supports zone-based firewall, IPS, and URL filtering, adding a powerful layer of defense against cyberthreats.

The router’s strong encryption and authentication mechanisms help protect sensitive data and transactions — whether you connect directly to the corporate LAN or through a remote VPN — securing your business communications against cyber attacks and unauthorized access.

Ease of Deployment and Operations

The Cisco 4331-AX/K9 is designed with simplicity in mind.
Using Cisco’s intuitive CLI, GUI, or API, your IT team can deploy, manage, and troubleshoot routers quickly.
Furthermore, the router supports network automation and scripting, allowing businesses to streamline operations and cut down on manual configuration and maintenance.

This makes it an ideal solution for growing enterprises that need to minimize their operational expenses while delivering maximum service availability.

Versatile Applications

Whether you need branch office routing, secure VPN, quality of service (QoS), or application optimization, the 4331 can handle it all.
It’s a perfect match for companies in sectors ranging from education and healthcare to financial services and retail.
The router lets you consolidate numerous services into a single, scalable platform — simplifying your network and reducing total cost of ownership.

FXO Port — Bridging Legacy PSTN with Modern Networks

One standout feature of the Cisco 4331-AX/K9 is its FXO port, which lets businesses connect their legacy phone lines directly to their router.
This means you can integrate a traditional PSTN phone service into your IP network, allowing for a smooth migration from legacy phone systems to modern VoIP solutions.
Whether you want to maintain a backup phone line for emergencies or connect a small branch directly to the PSTN, the FXO port provides a flexible and cost-effective way to keep all your communications unified and reliable.

Why Choose the Cisco 4331-AX/K9 Router?

The Cisco 4331-AX/K9 is the perfect choice for businesses that need a flexible, scalable, and reliable routing solution.
It seamlessly integrates legacy phone lines with modern IP networks, thanks to its FXO port, while offering high throughput, strong security, and rich service capabilities.
Whether you’re a small branch or a growing enterprise, this router lets you connect all your sites, employees, and services under a unified, adaptable platform — without needing to invest in separate hardware for each function.
With the 4331-AX/K9, you’re future-proofing your network against growing demands and simplifying operations, all while keeping costs under control.

For more details, you can find the datasheet on our website at the following link: