Reusing legacy systems is an effective strategy to maximize existing technology stack while transitioning to new, modern solutions.
In an era characterized by rapid technological advancements and the increasing demand for innovation, telecom operators often face the challenge of balancing the need for modernization with the realities of existing legacy IT systems. Legacy systems, while sometimes viewed as outdated or inefficient, still hold substantial value for telecom operators.
1. Incremental Modernization: no more big bangs
The hybrid approach allows telecom operators to effectively leverage the investments made in legacy systems while transitioning to new technologies in a manageable and strategic manner. By enabling coexistence, this strategy facilitates gradual modernization, operational continuity, and enhanced user experiences.
Instead of having a complete overhaul, gradually modernize components of the legacy system. You should do the assessment in order to identify which parts are most critical or outdated – and progressively upgrade those. As businesses adopt more modern functionalities, they can create a layered architecture that allows for easy integration of additional applications or services in the future.
By implementing changes gradually you will minimize the risk associated with system upgrades and avoid significant disruptions to service(s) which also leads to preserving high levels of customer satisfaction.
One of the key points of this strategy is that it would allow operators to prioritize upgrades based on the existing business needs and latest customer feedback, which empowers Telecom operators to easily adapt to changing market demands.
Last but not the least – TCO reduction. Incremental modernization spreads costs over time, making it more manageable for operators. This strategy provides budget flexibility, focusing on investment in essential system upgrades while maintaining the functionality of other systems.
2. API implementation
Implement APIs to allow the legacy systems to communicate with newer applications ensuring seamless data flow and functionality without the need for complete system overhauls. This enables interoperability while leveraging existing functionalities.
What are some key points of implementing APIs?
Faster Time to Market: with APIs, telecom operators can accelerate the development and launch of new products and services, responding quickly to competitive pressures and market opportunities.
Ehanced Service Offering: APIs can be used to create and integrate new services, such as SMS gateways, voice services, or mobile payment options, allowing operators to expand their offerings and improve customer satisfaction.
Scalability: APIs allow telecom operators to scale their services up or down easily, adapting to market demands and ensuring that resources align with customer needs.
API-Driven Revenue Models: Telecom operators can create new revenue streams by offering API access to their services and data to developers and businesses, turning datasets into monetizable assets.
As of February 2025, TM Forum’s Open APIs have been downloaded over 1 Million times.
Automation and Efficiency: Automating processes through APIs can reduce manual intervention, speeding up tasks such as customer onboarding, billing, and service provisioning ultimately leading to improved operational efficiency.
Ecosystem development: APIs enable telecom operators to collaborate with partners, developers, and third-party service providers, fostering innovation and expanding their service ecosystems.
3. The ETL process: data availability is the key
This is probably the most “beloved” part of a project for anyone who has participated some transformation projects. No wonder that Migrene and Migration start with same prefix.
The objective here is to focus on extracting valuable data from legacy systems for use in new systems in order to migrate essential data to modern databases while maintaining legacy systems for non-critical operations.
There is no easy way to do this, so probably the best is to first conduct a thorough assessment (make sure you cover ALL relevant systems) of the data stored within legacy systems to identify valuable datasets that are essential for the new systems. After that is done, prioritize the data based on relevance, usage frequency, and alignment with business goals.
Next step is data extraction and cleansing. Ensure that the extraction process captures all relevant fields, relationships, and historical data. Cleanse the extracted data to remove duplicates, inconsistencies, and outdated information. Transform the data into a compatible format for the new systems.
Map the data from legacy formats to the new database schema, ensuring that all mappings are clearly defined.
Finally, develop a detailed migration plan that outlines the steps, timelines, and stakeholders involved in the migration process. And of coarse, schedule the migrations during low-traffic periods to minimize disruption to ongoing operations.
4. Service Wrapper: creating abstraction layer
The “Wrap and Extend” approach involves creating a layer of abstraction (service wrapper) around the legacy systems to expose their functionalities as modern services, enabling Telecom operator to re-use the existing stack while adding new functionalities.
This also allows users to interact with the legacy systems without altering their core architecture, thereby maintaining stability while enabling greater adaptability.
Start by assessment to identify the key functionalities of the legacy system that should be exposed as services such as data retrieval, processing functionalities, or specific operations that users frequently need. Make sure that the exposed functionalities follow standard API design principles (i.e. RESTful or TM Forum), making them easy to understand and use for developers.
Implement data transformation routines within the service wrapper to convert data formats between the modern services and the legacy system as needed, ensuring smooth integration.
Service Wrapper will facilitate the integration of modern user interfaces (UIs) with the exposed services, allowing users to interact with legacy functionalities through different touchpoints: web apps, mobile apps, or other digital platforms. Telecom operators can focus on providing a better user experience by creating interfaces that simplify interactions with legacy functions, reducing the complexity typically associated with older systems.
The “Wrap and Extend” approach allows telecom operators to modernize their infrastructure incrementally. By creating a service-oriented layer (abstraction layer) around existing functionalities, Telcos can leverage investments in legacy systems while enhancing their responsiveness to modern business needs, improving user experience and paving the way for further innovation.
5. Business Process Reengineering
Business Process Reengineering (BPR) focuses on analyzing and redefining business processes that depend on legacy systems to enhance efficiency, reduce costs, and improve service delivery in an evolving business environment.
Identify which processes will be analyzed and reengineered, prioritizing those that most significantly impact customer experience and business performance. I have been writing previously about importance of improving customer experience, thus improving CX should be the key focus of business process reengineering and automation.
Ater you have identified the key processes, make sure to gather quantitative and qualitative data on process performance by collecting the input from stakeholders, employees, and customers to understand pain points and areas for improvement.
At Readiness IT – a CONKORD company, we can assist you with our tailored Telco Assessment offer(s) that includes business processes review, Gap Analysis, Technology Assessment (i.e. evaluating the limitations of legacy systems) that as a deliverable has executive report which includes analysis, key findings and insights, roadmaps, etc.
After all the assessment is done, start with redesign of the processess to eliminate unnecessary steps and streamline workflows. Here you can also identify opportunities for automation within the new processes, thereby reducing manual tasks and potential human errors, which improves overall efficiency.
Conclusion
Hybrid approach represents a strategic pathway for telecom operators to navigate the complexities of modernization while capitalizing on existing investments in legacy systems. This methodology combines the strengths of both legacy and modern systems, fostering a balanced and robust operational framework that supports a wide range of business objectives.
Embracing a strategy that values the strengths of existing systems while incorporating new technologies paves the way for sustainable growth, enhanced service delivery, and future readiness in a dynamic telecommunications landscape.
From cost savings and resource optimization to seamless integration with modern technologies and reduced risk during transformation programs, legacy systems can play a crucial role in supporting innovation and operational continuity.
One of the primary benefits of reusing legacy systems is cost efficiency. Telecom operators have invested significant resources — both financial and human — into these systems over the years. Rather than discarding them in favor of completely new solutions, operators can leverage existing functionalities, thus avoiding the substantial costs associated with development, implementation, and training that a new system would entail. By reusing legacy IT systems, organizations can redirect their budgets toward enhancing service capabilities or investing in innovative solutions that complement their existing infrastructure.
Reusing legacy IT systems does not imply that telecom operators must remain stagnant or unresponsive to technological advancements. Through approaches that we have mentioned, such as service wrapping and extending legacy functionalities, organizations can integrate modern technologies without abandoning their foundational systems. By creating application programming interfaces (APIs) that expose essential features of legacy systems as services, telecom operators enable seamless communication and interoperability between old and new software.
Another crucial advantage of reusing legacy systems is the reduction of risk associated with IT transformation projects. Transitioning to entirely new systems can lead to various challenges, including system incompatibilities, data loss, and operational downtime. By retaining legacy systems, telecom operators can ensure continuity of critical services during the transition period, minimizing disruption to day-to-day operations and user experience.
Finally, reusing legacy IT systems allows telecom operators to build a solid foundation for future innovation. Rather than viewing legacy systems as a hindrance to progress, operators can position them as integral components of a strategic initiative to remain competitive in a fast-evolving market. By maintaining a close relationship with legacy systems while incorporating innovative technologies, operators can create an adaptive environment conducive to growth and change.