CST

We are a software company based in Svilengrad, Bulgaria. Our services include: Software development and integration, including requirements gathering, specification, design and deployment. Software and network testing. Platform development of backend systems, web services, client and middleware APIs. VOIP and OTT solution design and development. Mobile development (Android and Microsoft). Our team has extensive experience in the areas \"Voice Over IP\", \"Unified Messaging\" and \"Mobile Development\" as well as in-depth knowledge of VOIP protocols SIP, RTP, RTCP. Our clients include major European telecommunication companies for which we have successfully developed VOIP and communication solutions. Some of the projects we have completed include: Development of pre-production RCS-e/JOYN co