The IAF has a long-standing requirement for new-generation radios and data links that can talk to existing IAF SDR. Development of IP Based Gateway Interface will provide solution to establish interoperability between SDRs of different make and hardware without dependency on the interoperable SDR waveform. IAF is in the process of procuring and deploying new generation SDRs for various airborne and C2 platforms. IAF SDRs can operate on L-Band, UHF & SATCOM. The vendor is expected to demonstrate the interoperability through IP Based Gateway Interface between two different SDR networks for voice and data both. Preliminary scope of solution being developed: 1. The IP Based Gateway Interface would include an interface for voice and data exchange between the two different SDR networks realised by IAF SDR and any Airborne SDR developed by Indian Industry. 2. The design and demonstration setup will be proposed by the vendor which may include combination of IAF SDR, Airborne SDRs developed by Indian Industry and Gateway Interface hardware. Demonstration for the interoperability through gateway interface would be conducted at Software Development Institute (SDI), Bengaluru. It will be divided in two phases viz. Phase I - Legacy and Secure Voice Communication and Phase II - Data Communication. 3. Phase I: It is proposed that voice communication in non- secure mode should be demonstrated as a proof of concept which can be executed without the need of ICD level information. Subsequently, for secure voice communication, the details of IAF SDR required for interfacing shall be facilitated through SDI. Based on which voice communication in secure mode should be demonstrated. The Lab evaluation of voice communication over gateway shall be assessed with reference to the quality of speech and delays observed in communication through gateway interface against the existing performance of IAF SDRs. 4. Phase II: Once the communication over non-secure and secure voice is proven through gateway interface, the vendor would demonstrate the exchange of defined data. 5. Post successful evaluation of Gateway solution at SDI, the flight trials (with IAF SDR as airborne member) shall be planned. The gateway solution shall be positioned within RT range of aircraft at trial location along with the other SDR at ground with Data and Voice reception end points to evaluate the interoperability. 6. After the successful demonstration during the flight trials, the technology transfer including details of software and electrical interface definitions of gateway interface to be shared with IAF.