Role: Solution Architect ( PSTN & IMS Core )

Experience: 12-15 Years

Location: Hyderabad, Bangalore, Chennai, Delhi

Key Responsibilities

- Design, plan, and deliver PSTN and IMS-based voice solutions, including:
- Fixed Voice
- VoLTE
- VoWiFi
- VoNR
- Emergency Services
- Interconnect and roaming services
- Regulatory voice services
- Translate business, operational, and service requirements into:
- Solution architecture
- High-Level Designs (HLDs)
- Low-Level Designs (LLDs)
- Implementation plans
- Migration strategies
- Deployment-ready engineering deliverables
- Define end-to-end PSTN and IMS architecture covering:
- P-CSCF
- I-CSCF
- S-CSCF
- TAS
- SBC
- HSS and UDM
- MGCF
- Media Gateway
- Signalling Gateway
- Design the integration of PSTN and IMS platforms with:
- EPC
- 5G Core
- Legacy voice networks
- Fixed-access networks
- Third-party telecom platforms
- Develop call-routing strategies, numbering plans, interconnect models, SIP trunking designs, and PSTN interworking solutions.
- Design and validate:
- Emergency calling services
- Lawful Intercept
- Mobile Number Portability
- Service continuity
- Disaster recovery
- Regulatory compliance requirements




- Conduct architecture governance and assurance activities, including:
- Technical design reviews
- Capacity planning
- Resiliency assessments
- Interoperability validation
- Risk analysis
- Security reviews
- Solution compliance assessments
- Manage HLD-to-LLD traceability and ensure alignment between requirements, architecture, implementation, testing, and production deployment.
- Provide technical leadership throughout:
- Integration and implementation
- PSTN-to-IMS migration
- Network transformation
- Software upgrades
- Testing and service validation
- Customer acceptance
- Rollback planning
- Production deployment
- Design integrations with:
- OSS/BSS platforms
- Charging systems
- Provisioning platforms
- Subscriber databases
- Network management systems
- Third-party telecom applications
- Collaborate with telecom operators, technology vendors, engineering teams, operations teams, and other stakeholders to resolve complex architecture and service-design challenges.
- Support cloud-native IMS evolution, automation, AI-assisted operations, and autonomous network initiatives.

📌 Solution Architect - PSTN & IMS Core (Hyderabad)
🏢 Tata Consultancy Services
📍 Hyderabad