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Survivability of systems is a very important system property and consists major concern for organizations and companies. Survivable systems should maintain their critical services functional in a timely manner. There are several approaches, proposed in the literature, on how to develop survivable telecommunication systems, but the majority is based on node outages or path failures, missing the main scope of survivability which is service failure. The contribution of this paper is that it presents a SDLC (Software Development Life Cycle) for developing survivable mobile telecommunication systems. Additionally, the main characteristic of a mobile telecommunication system is that it consists of different types of nodes (ex. MME, SGSN, etc.) that are connected to systems (ex. 5G, 4G, 3G, 2G etc.) and thus form an intersystem that provides services to end users. This interconnection and interoperability of network nodes is of high complexity constituting a threat to system survivability. Thus, another contribution of the current research work is that it provides a systematic approach for handling this complexity.