Cisco ISR 4000 Licenits SL-4320-UC-K9

The Cisco SL-4320-UC-K9 is a Unified Communications license for the ISR 4321 router in the Cisco ISR 4000 series. It activates the voice and collaboration services of IOS-XE, including SRST mode, which ensures continuity of local IP telephony when the central Cisco Unified Communications Manager is unavailable. It supports SIP and SCCP protocols for locally registered Cisco IP phones.

Ideal for small branch offices equipped with an ISR 4321 and a Cisco IP phone fleet, the SL-4320-UC-K9 provides voice resilience without the need for a dedicated gateway. It addresses the needs of IT managers seeking to maintain telephony continuity in decentralized environments. Genuine Cisco license, warranted and immediately activatable.