Redfone specializes in the development of unique connectivity solutions for popular Open Source voice platforms such as Asterisk®, Trixbox, and Elastix. Our unique philosophy of "externalizing" PSTN connectivity, combined with our extensive background in the engineering of critical data systems for the avionics industry sets apart from traditional PCI card vendors. Our solutions overcome some of the most significant challenges in deploying Open Source voice platforms, namely hardware compatibility, scalability and redundancy.