IMS Voice and Messaging Engineer

Job Description

Job Title: IMS Voice and Messaging Engineer – Service Testing We are seeking a highly skilled and experienced IMS Voice and Messaging Engineer for Service Testing to join our team. The ideal candidate will have a strong background in testing, validating, and troubleshooting IMS-based voice and messaging services (4G LTE and 5G NSA/SA), including VoLTE, VoNR, Vowifi, CSFB, SMS, MMS, Multi-SIM, USSD, Interconnect, National & International Roaming. You will be responsible for ensuring the quality, reliability, and performance of IMS based services through rigorous testing and validation processes. This role requires a deep understanding of IMS architecture, protocols, and end-to-end service flows. Key Responsibilities Service Testing and Validation: - Design, develop, and execute test plans, test cases, and test scripts for IMS-based voice and messaging services (4G/5G NSA/SA), including VoLTE, VoNR, Vowifi, CSFB, SMS, MMS, Interconnect, National & International Roaming, USSD, Multi-SIM etc. - Perform functional, performance, interoperability, and regression testing of IMS core network elements and services. - Validate end-to-end call flows, messaging flows, and service features to ensure seamless user experience. - Test and validate supplementary services such as call forwarding, call waiting, and conferencing etc. Troubleshooting and Issue Resolution: - Identify, analyze, and troubleshoot issues in IMS voice and messaging services during testing phases. - Work closely with design, operations, and vendor teams to resolve defects and ensure timely delivery of solutions. - Conduct root cause analysis for service failures and implement corrective actions. Automation and Tools: - Utilize network testing tools (e.g., Spirent, IXIA, Wireshark, Tektronix) to simulate traffic and validate service behavior. Documentation and Reporting: - Document test results, defects, and resolutions in a clear and concise manner. - Prepare detailed test reports and provide recommendations for service improvements. - Maintain up-to-date documentation of test processes, configurations, and procedures. Collaboration and Support: - Collaborate with cross-functional teams, including core network, RAN, BSS, IPTX, Cloud, RF teams to ensure seamless service delivery. - Provide technical support during service launches and post-deployment phases. Required Skills and Qualifications Education: - Bachelor’s degree in Telecommunications, Computer Science, Electrical Engineering, or a related field. Experience: - Minimum of 5 years of experience in IMS voice and messaging service testing and validation. Technical Skills: - Strong understanding of IMS architecture, protocols, and interfaces (e.g., SIP, RTP, Diameter, HTTP/2). - Hands-on experience with VoLTE, VoNR, IMS, SMS, MMS, Interconnect, National & International Roaming, Multi-SIM, USSD, SS7/STP etc. - Proficiency in network testing tools such as Spirent, IXIA, Wireshark, Tektronix, or similar. - Knowledge of 4G LTE, 5G (NSA/SA), and legacy network architectures and interfaces. - Familiarity with QoS, traffic engineering, and network security principles. - Experience with virtualization and cloud-native technologies (e.g. Kubernetes). Soft Skills: - Strong analytical and problem-solving skills. - Excellent communication and teamwork abilities. - Attention to detail and a commitment to delivering high-quality results. Preferred Qualifications - Knowledge on Mavenir Core Applications will be an advantage. - Knowledge of 3GPP standards and specifications for Packet Core, Voice & Data services.