I came accross this part when searching for a 2811 series routers
I have come accross the FL-CCME-36 and FL-SRST-36 before but never seen this licence, it is intruiging, does it suggest 75 user SRST gateway on a CUCMBE?
Cisco Unified Border Element (formerly Cisco Multiservice IP-to-IP Gateway)
The Cisco Unified Border Element (Cisco UBE) is an intelligent unified communications network element. Formerly known as the Cisco Multiservice IP-to-IP Gateway, the Cisco Unified Border Element, in addition to other Cisco IOSÂ® Software features, includes session border controller (SBC) functions that enable end-to-end IP-based transport of voice, video, and data between independent unified communications networks. SBCs are critical components for scaling unified communications networks from being "IP islands" within a single customer network to becoming an end-to-end IP community. One of the most significant uses of the Cisco Unified Border Element is to allow call control elements such as Cisco Unified Communications Manager to connect to service providers for public switched telephone network (PSTN) access offerings over Session Initiation Protocol (SIP) trunks. Today, the Cisco UBE is used as an IP-to-IP gateway by service provider, enterprise, and commercial customers to interconnect SIP and H.323 voice and video networks.
The Cisco Unified Border Element is a simple and cost-effective solution that provides a network-to-network demarcation interface for signaling interworking, media interworking, address and port translations, billing, security, quality of service (QoS), and bandwidth management. The Cisco Unified Border Element enhances the PSTN-to-IP features of a traditional Cisco gateway by adding the capability to join two voice-over-IP (VoIP) or video communications networks without the need for transiting through the TDM-based PSTN
FL-CUBE-75(=) Feature license applicable on any Cisco IOS Software platform for 75 simultaneous sessions
Hope this helps!