Solution Architect - PSTN & IMS Core

Role: Solution Architect ( PSTN & IMS Core )

Experience: 12-15 Years

Location: Hyderabad, Bangalore, Chennai, Delhi

Job Description:

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.