This is a Request for Information (RFI) from the Defense Information Systems Agency (DISA) seeking vendor capabilities for a Media Gateway (MGW) solution to replace end-of-life equipment that bridges legacy UHF tactical radios and modern MUOS satellite communication systems. The MGW must enable seamless, secure voice and data interoperability between analog endpoints and IP-based secure terminals across classified and unclassified networks, with support for ITU-T V.150.1 and Session Initiation Protocol (SIP) architecture. Vendors are asked to provide white papers detailing their technical approach, past experience, cost estimates, and compatibility with future IP-based cryptographic devices. The government will not reimburse response costs, and this RFI does not commit to issuing a solicitation or award. No timelines, budget amounts, or performance location are specified in the public description.