{"product_id":"l-sl-4320-uc-k9","title":"Cisco L-SL-4320-UC-K9 | UC (Voice) License for ISR 4321 | 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-4320-UC-K9 | ISR 4321 Unified Communications Technology Package License | E-Delivery\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0 0 14px 0;\"\u003eThe \u003cstrong\u003eL-SL-4320-UC-K9\u003c\/strong\u003e is a \u003cstrong\u003eCisco ISR 4321 Unified Communications Technology Package License\u003c\/strong\u003e — the complete voice and collaboration feature set for the Cisco ISR 4321 Integrated Services Router. This \u003cstrong\u003eCisco ISR 4321 UC license\u003c\/strong\u003e unlocks TDM\/PSTN gateway capabilities, voice conferencing, codec transcoding, FAX services (T.37\/T.38), and Call Admission Control (CAC), making it the essential upgrade for mid-size branch and campus deployments that need a high-quality IP-PBX and PSTN integration platform with the performance of IOS XE.\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eAlso referenced as \u003cstrong\u003eSL-4320-UC-K9\u003c\/strong\u003e or \u003cstrong\u003eL-SL-4320-UC-K9=\u003c\/strong\u003e, this \u003cstrong\u003eCisco ISR 4321 UC license\u003c\/strong\u003e is a perpetual IOS XE Smart License that upgrades the ISR 4321 to a full-featured voice gateway. The license includes feature add-ons for \u003cstrong\u003eCisco Unified Communications Manager Express (CME)\u003c\/strong\u003e for local IP-PBX call control, \u003cstrong\u003eSurvivable Remote Site Telephony (SRST)\u003c\/strong\u003e for WAN outage resilience, \u003cstrong\u003eCisco Unified Border Element (CUBE)\u003c\/strong\u003e for enterprise SIP trunk termination and protocol normalization, \u003cstrong\u003eGatekeeper\u003c\/strong\u003e for H.323 call routing, and \u003cstrong\u003eVXML\/IVR\u003c\/strong\u003e for interactive voice response applications. \u003cstrong\u003eDSP modules (PVDM4)\u003c\/strong\u003e are required for voice processing — the UC license enables the software features; DSPs provide the media processing hardware. Whether you are building a mid-size branch PBX or connecting a regional office to a centralized CUCM cluster, the \u003cstrong\u003eISR 4321 UC license e-delivery\u003c\/strong\u003e delivers enterprise voice on the ISR 4000 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\u003eTDM\/PSTN Gateway\u003c\/strong\u003e — connect legacy PSTN trunks (FXO\/FXS\/T1\/E1\/PRI\/BRI) to your VoIP network with full protocol interworking\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\u003eCisco CME and SRST\u003c\/strong\u003e — built-in IP-PBX (CME) for local call control and Survivable Remote Site Telephony (SRST) for WAN outage resilience\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\u003eCisco Unified Border Element (CUBE)\u003c\/strong\u003e — enterprise session border controller for SIP trunk termination, protocol normalization, and inter-domain peering\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\u003eVoice conferencing and codec transcoding\u003c\/strong\u003e — multi-party audio conferencing and real-time codec conversion between G.711, G.729, iLBC, and more\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\u003eFAX T.37\/T.38 and modem passthrough\u003c\/strong\u003e — reliable fax over IP (FoIP) with T.38 real-time relay and T.37 store-and-forward fax for enterprise workflows\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\u003eCAC and QoS for voice\u003c\/strong\u003e — Call Admission Control and advanced QoS policies ensure toll-quality voice even under congested WAN conditions\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\u003ePermanent License\u003c\/strong\u003e — one-time purchase, no recurring subscription fees\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 Ideal for \u003cstrong\u003emid-size branch PBX, SIP trunking, and regional voice hub\u003c\/strong\u003e deployments on the ISR 4000 platform\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\u003eL-SL-4320-UC-K9\u003c\/strong\u003e is exclusively compatible with the \u003cstrong\u003eCisco ISR 4321\u003c\/strong\u003e Integrated Services Router running IOS XE. Requires IOS XE software version 16.x or later with Smart Licensing enabled. \u003cstrong\u003eDSP modules (PVDM4)\u003c\/strong\u003e are required for voice gateway, conferencing, and transcoding functions — the UC license enables the software; DSPs provide the media processing hardware. \u003cstrong\u003eNot compatible\u003c\/strong\u003e with ISR 4221 (no UC support on that model) or other ISR 4000 Series models. Please verify your router model and DSP configuration before purchase.\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 4321 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 ISR 4321 Unified Communications technology package license\u003c\/strong\u003e is delivered electronically. Once your device UDI is confirmed, we will send you the \u003cstrong\u003elicense entitlement by email\u003c\/strong\u003e. No physical shipment is required .\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003e\u003cstrong\u003eThis license on sale are available exclusively Traditional License.\u003c\/strong\u003e\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 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-4320-UC-K9  |  L-SL-4320-UC-K9  |  SL-4320-UC-K9=  |  L-SL-4320-UC-K9=\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Cisco","offers":[{"title":"Default Title","offer_id":46953917251804,"sku":"L-SL-4320-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-4320-UC-K9.jpg?v=1776688506","url":"https:\/\/switchlicense.com\/products\/l-sl-4320-uc-k9","provider":"Switch License","version":"1.0","type":"link"}