Cisco 3900 Router License – SL-39-DATA-K9= Data License for Cisco 3900 Series 3925 3945 Routers. 2901 2911 2921 2951 Router Cisco ISRs deliver innovative technologies running on the industry-leading Cisco IOS Software. Cisco ISR G2 routers ship with a universal Cisco IOS Software image that contains all the features available for use on the routers. A specific feature set is activated by using technology package licenses such as Security, Unified Communications, and Data. Figure 1 shows the Cisco IOS Software packaging model for the Cisco 3900, 2900, and 1900 Series Integrated Services Routers. IOS Packaging Model for 3900, 2900 and 1900 Series Integrated Services Routers.