Voice Security Cisco ISR4331 Branch Router 2 NIM Slots Industrial Network Router

The Cisco ISR4331-V/K9 is the voice and security bundle of the ISR 4300 Series, a 1RU branch platform that carries data, voice and VPN traffic on one chassis. It offers 100 Mbps to 300 Mbps aggregate throughput, three RJ-45 GE ports plus two GE SFP ports, 2 NIM slots, 2 SM-X service-module slots and 4 GB DRAM with 4 GB flash as factory default, expandable to 16 GB each.

This bundle ships with the voice package: a PVDM4-32 digital signal processor, the unified communications license and a CUBE-25 session license, plus the K9 security image for IPsec VPN and zone-based firewall. For a branch that has to register IP phones, terminate SIP trunks and keep guest traffic separated without adding a second appliance, the ISR4331 voice router is the single-box answer. LonRise Equipment Co. Ltd. is an agent and distributor for Cisco enterprise equipment and supplies this branch router with clean serial numbers and Smart Net eligible status.

• Voice-ready bundle: PVDM4-32 DSP, unified communications license and CUBE-25 session license are included, so IP telephony and SIP trunking work without extra hardware.
• Built-in security: the K9 security image adds IPsec VPN, zone-based firewall and encrypted management to the same chassis.
• 2 NIM slots: two Network Interface Module slots plus 2 SM-X and 1 ISC slot allow LTE, voice, serial or switching modules to be added as the branch grows.
• Flexible WAN mix: three RJ-45 GE ports and two GE SFP ports let copper, fiber or a mix of both terminate directly on the router.
• Branch-grade reliability: 1RU rack-mount steel chassis with internal AC or PoE power supply, redundant power option not required for single-supply branch cabinets.
• Low power draw: about 42 W typical with no modules, which keeps heat and UPS sizing modest in small enclosures.
• Lifecycle friendly: Cisco IOS XE software, Smart Net eligible hardware and export-grade packaging support multi-year rollouts.

Because the chassis carries voice, routing and security together, the ISR4331 is normally installed where floor space and cabinet depth are limited. Common roles for this industrial network router include:

1. Branch offices that need IP telephony, SIP trunking and guest Wi-Fi segmentation on one box.
2. Manufacturing and logistics sites using the router as WAN edge for plant and warehouse networks.
3. Retail chains and bank outlets with small cabinets and no room for separate voice gateways.
4. Enterprises migrating from ISR G2 platforms that want a like-for-like 1RU replacement.
5. Lab, staging and disaster-recovery racks where spare voice-capable routers must be ready to swap in.

V marks the voice bundle and K9 marks the security feature set. In practice you receive the ISR4331 chassis with 4 GB DRAM and 4 GB flash, a PVDM4-32 DSP module, the unified communications license and a CUBE-25 session license, together with the IOS XE security image for IPsec VPN and firewall functions.

The chassis provides 2 NIM slots, 2 SM-X service-module slots with one double-wide position, and 1 ISC slot for the DSP. That is enough for LTE backup, additional voice ports, a switching module or a service module without replacing the platform.

It is widely used as an industrial network router at plant and warehouse WAN edges: 1RU steel chassis, internal AC supply, roughly 42 W typical draw and standard 19-inch mounting. For cabinets with heavy vibration or wide temperature swings, confirm the environmental limits of the enclosure before installation.

LonRise Equipment Co. Ltd. supplies this ISR4331 voice router as a Cisco equipment agent and distributor, with clean serial numbers and Smart Net eligible hardware. Orders are dispatched by DHL, FedEx, UPS or TNT on a door-to-door basis, and units are tested and inspected before packing.

Every ISR4331-V/K9 is shipped new in its Cisco box with rack-mount ears, documentation and accessory kit, then packed in export-grade cartons with foam protection. LonRise Equipment Co. Ltd. checks serial numbers and hardware condition before dispatch, supports sample orders of a single unit, and can supply repeat quantities for multi-site rollouts. Warranty claims are handled through the serial number on each chassis so field replacements stay traceable.