IMS Core Engineer

Key Responsibilities

• Manage networks and nodes within the IMS domain for our 2.5G, 3G & 4G networks (SIP, H323, IMS/IMT, VoLTE, VoWiFi)
• Using dashboards (and building new ones) to clearly and quickly discover issues and patterns
• Accountable and responsible to follow the communications procedures in place when handling an incident. Communication is both internal within our company and external to our third-party providers.
• Maintenance, troubleshooting, security audits, and emergency response
• Undertake fault handling and corrective actions on node, service and infrastructure level
• Handle project activities, implementing / adapting (new) IMS E2E service functionalities, nodes, services
• When needed, cover the 7x24 monitoring shift responsibilities (On call support, Baby Sitting activities etc.)
• Wireshark tracing of critical infrastructure to debug issues
• Provide input, implement and verify improvements in processes and work instructions
• Verify and implement configuration changes
• Work to identify and drive improvement

Key Qualifications

• At least 10 years’ experience in the core network domain with a mobile networks
• Holding a BSc degree in Telecommunication or Computer Science (post-graduate studies are a bonus) and 10+ years core telecommunications network experience
• Working knowledge of telecom networks like 2G, 2.5G, 3G and LTE (MME, SGW, PGW, and MME)
• Great Conceptual understanding of IMS evolution and trends - IMS Subsystems, functionalities and IMS services call flows
• Great knowledge of IMS network topology (their various interfaces), Core IMS Parameters and Features
• Worked on different type of Core Nodes, CSFB, IMS (P-CSCF, I-CSCF, S-CSCF, MTAS, HSS, CUDB, MGCF, etc.)
• Experience with SS7, ISUP, BICC, SIP, H248, Diameter signaling & protocols configuration change IMS based services is necessary
• Operation and maintenance of IMS platforms for Alarms, faults/abnormal conditions handling, Analysis of traces, High troubleshooting skills, system backup/restore from backup files, Fault Diagnostics, Preventive Maintenance & upgrades of IMS nodes
• Hands on with sniffers, Wireshark and testing tools in advanced mode
• Hands on with Linux/Unix based systems (you can find your way around a linux shell)
• Understanding of 3GPP, ITU-T and ANSI standards
• Understanding of roaming agreements and IR.21, including IREG testing
• VoLTE Troubleshooting and call trace analysis
• Strong writing and documentation skills are needed to develop reports
• Adaptability and responding to change
• Be able to work under pressure
• You are fluent in English (written and spoken)
• Ready to work on morning/afternoon shifts
• Good interaction with external customers and internal teams

Nice to have

• 2+ years scripting experience (Python, Bash, etc.)