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Nowadays, Instant Messaging is a very successful service thanks to its versatility and simplicity in the communication offered to users, which is a key feature for the demanding environment of connectivity and mobility that modern society requires. With the success of mobile telephony, new alternatives for this kind of services appear however, an environment of low and complex interoperability was the result of protocols and transport technologies diversity. This article describes PAUMIN (Universal Access Platform to Mobile Instant Messaging), a universal platform that enables the communication between different instant messaging providers using mobile devices. This project was performed by the Mobile and Wireless Applications Development Interest Group (W@PColombia), assigned to Telematics Engineering Group, University of Cauca, Colombia.