• Cisco L-SL-44-UC-K9 | UC (Voice) License for 4431/4451 | E-Delivery
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Cisco L-SL-44-UC-K9 | UC (Voice) License for 4431/4451 | E-Delivery

Cisco L-SL-44-UC-K9 | UC (Voice) License for 4431/4451 | E-Delivery

Cisco L-SL-44-UC-K9

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About This Product

About This Product

Buy Cisco L-SL-44-UC-K9 | ISR 4400 Series Unified Communications (UC) Technology Package License for ISR 4431 & ISR 4451-X | E-Delivery

This license on sale are available exclusively Traditional License.

The L-SL-44-UC-K9 is the Cisco ISR 4400 Series Unified Communications (UC) Technology Package License — the complete voice and video collaboration unlock for your Cisco ISR 4431 and ISR 4451-X Integrated Services Routers. This Cisco 4400 UC license builds on the IP Base foundation to deliver enterprise-grade voice, video, presence, and instant messaging capabilities including Cisco Unified Communications Manager (CUCM) integration, multi-protocol voice/video support (SIP, H.323, MGCP), and secure encrypted media (SRTP) — transforming your branch router into a full-featured collaboration platform.

Also referenced as SL-44-UC-K9, SL-44-UC-K9=, or L-SL-44-UC-K9=, this Cisco ISR 4400 Unified Communications technology package is a perpetual, electronically delivered Right-to-Use (RTU) license. The UC license enables: SIP, H.323, and MGCP protocol support for multi-vendor voice and video interoperability, CUCM integration for centralized call management and unified dial plans, SRTP encryption for secure voice and video streams, unified presence and instant messaging for real-time collaboration, advanced voice QoS with jitter minimization for crystal-clear audio, multi-party video conferencing natively on the router, and dual-stack IPv4/IPv6 support. For distributed enterprises, branch offices, and organizations consolidating their UC infrastructure, the Cisco 4400 UC license delivers carrier-grade voice and video on a single, cost-effective routing platform.

✅ Key Features

  • • Multi-protocol voice & video — SIP, H.323, and MGCP support with G.711, G.729, and wideband audio codecs
  • • CUCM integration — centralized call management, unified dial plan, and feature configuration via Cisco Unified Communications Manager
  • • SRTP encryption — Secure Real-Time Transport Protocol for encrypted voice and video streams with secure authentication
  • • Unified presence & IM — real-time presence status and integrated instant messaging across the organization
  • • Multi-party video conferencing — native video call and conference capabilities directly on the router platform
  • • Advanced voice QoS — voice traffic prioritization and jitter minimization for crystal-clear audio on congested links
  • • Perpetual RTU license — one-time purchase, right-to-use activation, no recurring subscription or annual renewal fee

Compatible Platform

The SL-44-UC-K9 Unified Communications license is exclusively compatible with the Cisco ISR 4431 (all models: ISR4431/K9, ISR4431-AX/K9, ISR4431-AXV/K9, ISR4431-SEC/K9, ISR4431-V/K9) and the Cisco ISR 4451-X (all models: ISR4451-X/K9, ISR4451-AX/K9, ISR4451-SEC/K9, ISR4451-V/K9). Requires a universalk9 IOS XE image with IP Base foundation. Supports both IPv4 and IPv6 dual-stack deployments. Not compatible with ISR 4321, ISR 4331, ISR 4351, ISR 4461, or Catalyst 8000 Series routers. For ISR 4331, use SL-4330-UC-K9. For ISR 4351, use SL-4350-UC-K9. For combined UC + Security + Application features, consider SL-44-APP-K9 (AppX bundle).

Information Needed

To generate your license file, please send the output of show license udi from your Cisco ISR 4400 Series router to support@switchlicense.com, or leave a message online after placing your order. The license file is tied to your specific device UDI and cannot be transferred to another unit.

License Delivery

This Cisco software license is delivered electronically. Once your device UDI is confirmed, we will send you the .lic license file by email. No physical shipment is required — simply install the file on your ISR 4400 Series router and the full Unified Communications feature set is immediately active.

Warranty

We provide a 100% working warranty on all licenses. If the license file does not activate correctly on your device, we will resolve the issue at no additional cost. All payments are processed securely via PayPal for your peace of mind.

Part Numbers: SL-44-UC-K9  |  L-SL-44-UC-K9  |  SL-44-UC-K9=  |  L-SL-44-UC-K9=

Technical Specifications

BrandCisco
ModelL-SL-44-UC-K9
License FeatureUC (Voice) License for 4431/4451 | E-Delivery
License TypePermanent Traditional License
Compatibility ISR4431/K9 | ISR4431-AX/K9 | ISR4431-AXV/K9 | ISR4431-SEC/K9 | ISR4431-V/K9
Delivery FormatE-Delivery by E-mail with LIC formation license
Lead TimeWithin 24 hours by e-mail after device information received
WarrantyOriginal from Cisco ,100% Guaranteed Functional

How You'll Receive Your Order

Place Your Order
Complete checkout securely. PayPal, Visa, Mastercard & Amex accepted.
Send Device Info
Email your device S/N or UDI so we can bind the license correctly.
We Process & Verify
Our Cisco-certified engineers prepare and verify your license file.
Receive & Deploy
License file delivered to your email. Install and activate immediately.

Important: Please send your device Serial Number (S/N) or UDI to support@switchlicense.com after placing your order. This is required to bind the license to your specific device.

Same Business DayAverage delivery after info received
Delivered by EmailLicense file sent directly to your inbox
Place Your Order
Complete checkout securely. PayPal, Visa, Mastercard & Amex accepted.
Quality Inspection
Unit is tested, cleaned and packed by our engineers. Ready in 1–2 business days.
Shipped Worldwide
Dispatched via FedEx / DHL / UPS with full tracking provided.
Delivered to You
Arrives in 3–7 business days. 90-day warranty starts from delivery date.

Shipping carriers: We ship via FedEx, DHL, and UPS depending on your region. A tracking number will be emailed to you once your order is dispatched. Questions? Contact us at support@switchlicense.com

1–2 Days ProcessingInspection & packing before dispatch
3–7 Business DaysWorldwide via FedEx / DHL / UPS

Warranty & Quality Guarantee

Lifetime Warranty — No Expiry, No Exceptions

Every software license we sell is 100% genuine Cisco original, sourced from authorized channels. Your license is permanently activated and fully transferable. If it ever stops working due to a product defect, we replace it for free — for life. No questions asked.

100% Authentic Cisco

Never cloned or modified. Every license comes with proof of authenticity and original activation records.

Fully Activated & Ready

Pre-verified and activated before dispatch. Deploy immediately with zero setup friction.

Full Documentation

License keys, activation codes, and all relevant documentation included with every order.

90-Day Comprehensive Warranty

All pre-owned Cisco hardware is professionally inspected, cleaned, and stress-tested by our Cisco-certified engineers. We guarantee full functionality for 90 days from delivery. If the unit fails within this period, we will repair or replace it at no cost to you.

Professionally Refurbished

Fully disassembled, cleaned, and tested to meet original Cisco factory specifications.

DOA Replacement

Dead on arrival? We ship a replacement unit immediately with priority shipping — no delays.

Safe Packaging

Anti-static wrap, custom foam inserts, and secure outer boxing prevent transit damage.

All products are individually inspected and verified by our Cisco-certified engineers before dispatch. Questions? Our team responds within 24 hours via WhatsApp or email.

Information Required from Buyer
Action Required After Purchase — Please Read Before Ordering

Cisco licenses are device-specific — each license must be bound to a unique device identifier before it can be activated. To process your order, we require the following information from your device after purchase.

1
Find Your UDI or S/N Run show license udi or show version on your device CLI to locate the Unique Device Identifier.
2
Complete Your Purchase Place your order as normal. No device info is needed at checkout — you'll send it to us after payment.
3
Email Us Your Device Info Send your UDI or Serial Number (S/N) to us via email or WhatsApp. We'll generate your license file right away.

Send your device info to support@switchlicense.com or via WhatsApp — we'll deliver your license within 24 hours on business days.

License Activation Steps

1
Find Your UDI
Run 'show license udi' on your ISR4000 CLI. Send the UDI to support@switchlicense.com after placing your order.
2
Upload License File
Transfer the .lic file to the router flash storage: 'copy tftp: flash:' or via USB with 'copy usbflash0: flash:'
3
Install License
Run 'license install stored-location flash:filename.lic' in privileged EXEC mode to install and activate the feature license.
4
Verify & Reload
Confirm with 'show license all' and 'show platform'. Reload the device with 'reload' command to complete activation.

Frequently Asked Questions

1 Is this license genuine and legally transferable?
This is a 100% genuine Cisco license, originally issued to an enterprise organization that has since upgraded or replaced their infrastructure. The license comes from decommissioned equipment and has never been activated — making it completely clean and ready to bind to your device. It is fully legitimate and legally transferable under Cisco's licensing policy.
2 How will I receive the license after payment?
After completing your purchase, simply email your device's UDI (Unique Device Identifier) or Serial Number to support@switchlicense.com. Once we receive your device information, your license file will be generated, verified by our Cisco-certified engineers, and delivered to your inbox within 24 hours on business days. You'll receive a .lic file along with installation instructions.
3 Can the license be transferred to a different device in the future?
Yes, the license can be transferred to another device if needed. The transfer process is managed through Cisco's license LRP. If you need assistance with the transfer process, our team is happy to guide you through every step.

Need Bulk Pricing or Technical Support?

Our Cisco-certified engineers are ready to help — support@switchlicense.com

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Why Buy From SwitchLicense

Trusted by IT teams, MSPs, and enterprise procurement specialists across 30+ countries.

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Send us your UDI after checkout and receive your verified .lic file the same business day.

Same day
DOA replacement first

Hardware arrives faulty? We ship a replacement unit to you immediately — before you return the original. No delays, no disputes.

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Worldwide via FedEx, DHL, and UPS. Assisted customs clearance available for Vietnam, Thailand, Singapore, Malaysia, and Australia.

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