Core Network Engineer; IMS

Core Network Engineer (IMS) Job Number: 26-00673 Use your skills where innovative technology solutions begin. ECLARO is looking for a Core Network Engineer (IMS) for our client in Richardson, TX. ECLARO’s client is a leading technology solutions provider, collaborating with customers to manage their needs and achieve success in their business goals. If you’re up to the challenge, then take a chance at this rewarding opportunity!

Position Overview:

Core Network Engineer – IMS (VoLTE / VoNR) works within the Engineering department, responsible for IMS infrastructure as well as deploying, managing, and supporting solutions for wholesale customers. Responsibilities:
Core Network Management:
The Core Network Engineer (IMS) is responsible for the operational integrity, performance, and evolution of IMS voice services, including VoLTE and VoNR. The role focuses on the day-to-day operation, troubleshooting and optimization of the IMS platforms and interconnections . Operational ownership of IMS infrastructure components, including lifecycle management, configuration, software upgrades, vendor coordination, capacity planning, and fault resolution. Operational ownership of IMS interconnections, including SIP and SIP-I connectivity to PSTN, IPX providers, roaming partners, and emergency services (E911 etc).

Responsibilities include Client configuration, routing policies, codec negotiation, security controls, and interconnect testing. Act as the technical escalation point and subject matter expert for IMS voice services, including VoLTE and VoNR call flows, SIP signalling, RTP media handling, using the open source 5G (NSA / SA) core platforms. Support Roaming and Wholesale teams in the implementation of new roaming agreements, with particular focus on VoLTE and VoNR roaming, including configuration support, IREG testing, and fault resolution during commercial launch of service.

Projects:
Work with Solution Architects to turn solutions designed for wholesale customers into High Level Design (HLD) documentation. When assigned, take ownership of solution deployment for contracted wholesale customers. Participate in post-mortem meetings after each project completion to identify learnings that can be applied in future projects. Operations:
Support the Network Operations Centre (NOC) with live wholesale and retail customer support, including both proactive and reactive identification / troubleshooting and resolution of issues. Participate in incident response, root cause analysis (RCA), and post-incident reviews for IMS voice services. Support planned maintenance, change management, and software upgrades with appropriate risk mitigation and rollback procedures. Participate in emergency call rotation for critical issues.

Skills Development:
Continuously develop expertise across IMS, VoLTE, VoNR, and emerging voice technologies, including 5G SA voice evolution and roaming capabilities. Measurement:
Performance will be measured using a combination of service availability, mean time to resolution (MTTR), successful deployment and launch of IMS voice services, reduction in repeat incidents, and quality of technical documentation and handover.

Required Qualifications:

Bachelors or Master's degree in Engineering, Computer Science, or related field. Minimum of 5-8 years working in the telecommunications industry designing, integrating, and managing mobile IMS networks and interconnections for wireless carrier / MNO, MVNO, etc. In-depth knowledge of the IMS network elements, interfaces, protocols, and call flows. Expert knowledge of Voice SIP / RTP and voice convergence technologies, IMS applications (including VoLTE and VoNR), voice traffic (home network, roaming, PSTN, etc.)

Ability to design and configure mobile data networks. General understanding of Circuit Switched communications protocols such as SS7 (including SCCP, TCAP, MAP, CAMEL, etc.), SIGTRAN, etc. Diameter Signaling, DRA & RADIUS. Demonstrable experience of managing & configuring IMS network elements including SBG, BGF, MTAS, CSCF, etc.

Experience with Ericsson products is a plus. Previous experience in management of the Ericsson MPBN is a plus. Good…