The Cisco 3900-AX ISR includes licenses for Data, Security, and WAAS Express (WAASX), and a RTU for 2500 WAAS or vWAAS connections. The Cisco 2911-AX includes a 1300 WAAS or vWAAS RTU license. You can use this RTU on any combination or multiples of modules for WAAS and/or vWAAS connections on the Cisco 2900-AX or 3900-AX Series Routers, respectively. The Cisco 1900-AX Series includes licenses for Data, Security, and WAASX.
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