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Multiline: RESTful APIs for Address Book, Contacts & Services

Building a Unified API Framework for Cross‑Platform Contact and Profile Services

A leading telecommunications provider needed a unified API framework to support cross-platform data synchronization for address book management, contact data, and profile services. The existing approach required seamless integration across Google and Microsoft ecosystems while supporting Android, iOS, and web clients at scale.

As subscriber growth increased and new services were introduced, ensuring consistent data synchronization and scalable API performance became critical. The client needed a structured approach to API development and integration—enabling seamless cross-platform experiences and supporting continued platform expansion.

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The Challenge

Unified Cross‑Platform Data Synchronization

The client needed unified cross-platform APIs for address book management, contact synchronization, and profile image retrieval — integrating with both Google and Microsoft account ecosystems and serving Android, iOS, and Web clients. The scope expanded significantly by adding new API services and scaling the platform to handle increased multiline subscriber growth.

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The Solution

Scalable RESTful API Architecture

Developed RESTful APIs for address book CRUD operations, contact profile image retrieval from Google and Microsoft accounts, web services gateway contacts retrieval, and comprehensive metrics logging. The expansion added new API endpoints for enhanced multiline management, subscriber provisioning, and cross-platform service orchestration.

Applications Managed

  • RESTful APIs
  • Google APIs
  • Microsoft APIs
  • iOS
  • Android
  • Web
  • Junit
  • Microservices

The Outcome

Enabling Seamless, Scalable Cross‑Platform Data Synchronization

  • Cross-platform API serving multiple teams
  • Google & Microsoft account integration
  • Scope expanded significantly

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Aditi is a leading digital engineering services company. We partner with established and emerging enterprises by leveraging borderless talent across three continents to achieve transformative outcomes that will reshape their trajectory. We lead and support our clients’ efforts to design, build, and operate the products, systems, and processes required to deliver impact by leveraging deep insights, practical knowledge, and human spirit.