{"product_id":"l-sl-44-uc-k9","title":"Cisco L-SL-44-UC-K9 | UC (Voice) License for 4431\/4451 | E-Delivery","description":"\u003cdiv class=\"product-desc\"\u003e\n\u003c!-- Section: About This Product --\u003e\n\u003cdiv style=\"margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eAbout This Product\u003c\/h2\u003e\n\u003ch3 style=\"font-size: 14px; font-weight: 600; color: #1a1a1a; margin: 0 0 10px 0;\"\u003eBuy Cisco L-SL-44-UC-K9 | ISR 4400 Series Unified Communications (UC) Technology Package License for ISR 4431 \u0026amp; ISR 4451-X | E-Delivery\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eThis license on sale are available exclusively Traditional License.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0 0 14px 0;\"\u003eThe \u003cstrong\u003eL-SL-44-UC-K9\u003c\/strong\u003e is the \u003cstrong\u003eCisco ISR 4400 Series Unified Communications (UC) Technology Package License\u003c\/strong\u003e — the complete voice and video collaboration unlock for your \u003cstrong\u003eCisco ISR 4431 and ISR 4451-X Integrated Services Routers\u003c\/strong\u003e. This \u003cstrong\u003eCisco 4400 UC license\u003c\/strong\u003e builds on the IP Base foundation to deliver enterprise-grade voice, video, presence, and instant messaging capabilities including \u003cstrong\u003eCisco Unified Communications Manager (CUCM) integration, multi-protocol voice\/video support (SIP, H.323, MGCP), and secure encrypted media (SRTP)\u003c\/strong\u003e — transforming your branch router into a full-featured collaboration platform.\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eAlso referenced as \u003cstrong\u003eSL-44-UC-K9\u003c\/strong\u003e, \u003cstrong\u003eSL-44-UC-K9=\u003c\/strong\u003e, or \u003cstrong\u003eL-SL-44-UC-K9=\u003c\/strong\u003e, this \u003cstrong\u003eCisco ISR 4400 Unified Communications technology package\u003c\/strong\u003e is a perpetual, electronically delivered Right-to-Use (RTU) license. The UC license enables: \u003cstrong\u003eSIP, H.323, and MGCP\u003c\/strong\u003e protocol support for multi-vendor voice and video interoperability, \u003cstrong\u003eCUCM integration\u003c\/strong\u003e for centralized call management and unified dial plans, \u003cstrong\u003eSRTP encryption\u003c\/strong\u003e for secure voice and video streams, \u003cstrong\u003eunified presence and instant messaging\u003c\/strong\u003e for real-time collaboration, \u003cstrong\u003eadvanced voice QoS\u003c\/strong\u003e with jitter minimization for crystal-clear audio, \u003cstrong\u003emulti-party video conferencing\u003c\/strong\u003e natively on the router, and \u003cstrong\u003edual-stack IPv4\/IPv6\u003c\/strong\u003e support. For distributed enterprises, branch offices, and organizations consolidating their UC infrastructure, the \u003cstrong\u003eCisco 4400 UC license\u003c\/strong\u003e delivers carrier-grade voice and video on a single, cost-effective routing platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Key Features --\u003e\n\u003cdiv style=\"margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003e✅ Key Features\u003c\/h2\u003e\n\u003cul style=\"margin: 0; padding: 0; list-style: none;\"\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eMulti-protocol voice \u0026amp; video\u003c\/strong\u003e — SIP, H.323, and MGCP support with G.711, G.729, and wideband audio codecs\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eCUCM integration\u003c\/strong\u003e — centralized call management, unified dial plan, and feature configuration via Cisco Unified Communications Manager\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eSRTP encryption\u003c\/strong\u003e — Secure Real-Time Transport Protocol for encrypted voice and video streams with secure authentication\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eUnified presence \u0026amp; IM\u003c\/strong\u003e — real-time presence status and integrated instant messaging across the organization\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eMulti-party video conferencing\u003c\/strong\u003e — native video call and conference capabilities directly on the router platform\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eAdvanced voice QoS\u003c\/strong\u003e — voice traffic prioritization and jitter minimization for crystal-clear audio on congested links\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003ePerpetual RTU license\u003c\/strong\u003e — one-time purchase, right-to-use activation, no recurring subscription or annual renewal fee\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Compatible Platform --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eCompatible Platform\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eThe \u003cstrong\u003eSL-44-UC-K9\u003c\/strong\u003e Unified Communications license is exclusively compatible with the \u003cstrong\u003eCisco ISR 4431\u003c\/strong\u003e (all models: \u003cstrong\u003eISR4431\/K9\u003c\/strong\u003e, \u003cstrong\u003eISR4431-AX\/K9\u003c\/strong\u003e, \u003cstrong\u003eISR4431-AXV\/K9\u003c\/strong\u003e, \u003cstrong\u003eISR4431-SEC\/K9\u003c\/strong\u003e, \u003cstrong\u003eISR4431-V\/K9\u003c\/strong\u003e) and the \u003cstrong\u003eCisco ISR 4451-X\u003c\/strong\u003e (all models: \u003cstrong\u003eISR4451-X\/K9\u003c\/strong\u003e, \u003cstrong\u003eISR4451-AX\/K9\u003c\/strong\u003e, \u003cstrong\u003eISR4451-SEC\/K9\u003c\/strong\u003e, \u003cstrong\u003eISR4451-V\/K9\u003c\/strong\u003e). Requires a \u003cstrong\u003euniversalk9 IOS XE image\u003c\/strong\u003e with IP Base foundation. Supports both \u003cstrong\u003eIPv4 and IPv6\u003c\/strong\u003e dual-stack deployments. Not compatible with ISR 4321, ISR 4331, ISR 4351, ISR 4461, or Catalyst 8000 Series routers. For ISR 4331, use \u003cstrong\u003eSL-4330-UC-K9\u003c\/strong\u003e. For ISR 4351, use \u003cstrong\u003eSL-4350-UC-K9\u003c\/strong\u003e. For combined UC + Security + Application features, consider \u003cstrong\u003eSL-44-APP-K9\u003c\/strong\u003e (AppX bundle).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Information Needed --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eInformation Needed\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eTo generate your license file, please send the output of \u003ccode style=\"background: #f5f5f5; padding: 2px 6px; border-radius: 3px; font-size: 13px;\"\u003eshow license udi\u003c\/code\u003e from your Cisco ISR 4400 Series router to \u003cstrong\u003e\u003ca href=\"mailto:support@switchlicense.com\" style=\"color: #0070d2; text-decoration: none;\"\u003esupport@switchlicense.com\u003c\/a\u003e\u003c\/strong\u003e, 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: License Delivery --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eLicense Delivery\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eThis \u003cstrong\u003eCisco software license\u003c\/strong\u003e is delivered electronically. Once your device UDI is confirmed, we will send you the \u003cstrong\u003e.lic license file by email\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Warranty --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eWarranty\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eWe provide a \u003cstrong\u003e100% working warranty\u003c\/strong\u003e 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 \u003cstrong\u003ePayPal\u003c\/strong\u003e for your peace of mind.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Part Numbers --\u003e\n\u003cdiv style=\"background: #f5f5f5; border-radius: 6px; padding: 14px 18px; font-size: 13px; color: #555; line-height: 1.8;\"\u003e\n\u003cstrong style=\"color: #1a1a1a;\"\u003ePart Numbers:\u003c\/strong\u003e SL-44-UC-K9  |  L-SL-44-UC-K9  |  SL-44-UC-K9=  |  L-SL-44-UC-K9=\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Cisco","offers":[{"title":"Default Title","offer_id":46957831782620,"sku":"L-SL-44-UC-K9","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0636\/6402\/9916\/files\/L-SL-44-UC-K9.jpg?v=1776688987","url":"https:\/\/switchlicense.com\/products\/l-sl-44-uc-k9","provider":"Switch License","version":"1.0","type":"link"}