Senior Engineer-CS/IMS Core

Ericsson; Dadri; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Ericsson is seeking an Engineer/Senior Engineer IMS/CS Core to lead reactive maintenance in Core Network domains. You will coordinate and troubleshoot high-level issues, ensuring service continuity and adherence to MSTOP. Strong knowledge of IMS/VoLTE architecture and telecom protocols is required.

The role demands 5+ years in Core Network operations, with hands-on experience in CS Core and IMS nodes, and optional IMS/VoLTE certifications. Bachelor’s degree in ECE is preferred.

Qualifications

• Bachelor's degree in Electronics and Communication Engineering or related field.
• 5+ years in Core Network operations and support, particularly IMS/VoLTE.
• Certifications in IMS, VoLTE, or Network Operations are optional but preferred.

Responsibilities

• Perform configuration changes, hardware expansions, and troubleshooting for CS Core nodes (MSC, MGW, HLR, HSS, STP) and IMS Core nodes (UDM, P-CSCF, I-CSCF, S-CSCF, ATS, MGCF, MRFP, CG, ENUM, DRA, UPG).
• Ensure actions follow approved operational processes (MSTOP).
• Conduct RCA and prepare technical reports; collaborate with cross-functional teams to drive resolution and network improvements; maintain documentation of configurations, issues, and resolutions.

Skills

IMS/VoLTE

SIP

Diameter

SIGTRAN

TCAP

MAP

SCCP

ISUP

H.248

INAP

BICC

Analytical skills

Communication

Education

Bachelor's degree in Electronics and Communication Engineering

Job description

About the Opportunity

We are looking for a Engineer/Senior Engineer IMS/CS Core to join our team and lead the coordination, execution, and troubleshooting of high-level reactive maintenance activities in Core Network domains. You will be responsible for supporting complex technical issues beyond the scope of 1st level Operations, ensuring service continuity and adherence to processes like MSTOP.

What You Will Do

• Perform configuration changes, hardware expansions, and troubleshooting activities for: CS Core Nodes: MSC, MGW, HLR, HSS, STP, SBC IMS Core Nodes: UDM (CUDB, HSS-FE, HLR-FE), P-CSCF, I-CSCF, S-CSCF, ATS, MGCF, MRFP, CG, ENUM, DRA, UPG.
• Ensure all actions follow approved and standardized operational processes (MSTOP)
• Conduct RCA (Root Cause Analysis) and prepare technical reports Collaborate with cross-functional teams to drive issue resolution and network enhancements Maintain documentation of configurations, issues, and resolutions.

You Will Bring

• Strong knowledge of telecom protocols including: SIP, H.248, SS7, ISUP, BICC, SIGTRAN, INAP, CAP, TCAP, MAP, SCCP, Diameter.
• Deep understanding of: Call flows in CS Core, IMS / VoLTE architecture and operations.
• Ability to troubleshoot and resolve complex IMS and legacy network issues Strong analytical and communication skills.

Key Qualifications

• Education: Bachelors degree in Electronics and Communication Engineering or related field Experience.
• Relevant 5+ years in Core Network operations and support, particularly IMS/VoLTE
• Relevant certifications in IMS, VoLTE, or Network Operations (optional but preferred)