Solution Architect - PSTN & IMS Core

Tata Consultancy Services; Hyderabad; On-site; INR 3,500,000 - 6,000,000; Full time

Job summary

Tata Consultancy Services in India is seeking a Solution Architect to lead PSTN and IMS-based voice solutions, including VoLTE, VoWiFi, and VoNR, with 12-15 years of experience. You will design end-to-end architectures and drive integration with 5G Core and EPC.

Role requires strong leadership in architecture governance, security, and regulatory compliance, along with migration planning and interconnect design for global telecom environments.

Qualifications

• Architect PSTN/IMS voice solutions with extensive design experience.
• Translate requirements into HLDs, LLDs, and implementation plans.
• Ensure regulatory compliance, security, and disaster recovery planning.

Responsibilities

• Define end-to-end PSTN/IMS architecture including P-CSCF, I-CSCF, S-CSCF, TAS, SBC.
• Develop call-routing strategies and SIP trunking designs.
• Plan migration and integration with EPC, 5G Core, and fixed networks.
• Lead architecture governance and assurance activities.
• Collaborate with operators, vendors, and engineering teams.
• Support cloud-native IMS evolution and autonomous network initiatives.

Skills

PSTN Architecture

IMS Core

VoLTE

VoWiFi

VoNR

Emergency Services

Interconnect Roaming

Regulatory Compliance

SIP Trunking

Security Reviews

Job description

Role: Solution Architect ( PSTN & IMS Core )

Experience: 12-15 Years

Job Description:

Key Responsibilities

• Design, plan, and deliver PSTN and IMS-based voice solutions, including:
• VoLTE
• VoWiFi
• VoNR
• Emergency Services
• Interconnect and roaming services
• Regulatory voice services
• Translate business, operational, and service requirements into:
• High-Level Designs (HLDs)
• Low-Level Designs (LLDs)
• Implementation plans
• Migration strategies
• 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
• 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
• Service continuity
• Disaster recovery
• Regulatory compliance requirements
• Conduct architecture governance and assurance activities, including:
• Capacity planning
• Resiliency assessments
• Interoperability validation
• 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
• Design integrations with:
• OSS/BSS platforms
• Charging 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.