About this opportunity
Ericsson is seeking a highly skilled MS Core Cloud Specialist - CS Core • IMS to join our team in Sydney, NSW. This senior role requires deep expertise in Ericsson IMS stack and Nokia MSS/MSC-S platforms to manage and evolve voice core infrastructure across Australian Data Centers.
What you will do• Operate and maintain Ericsson IMS nodes (P/S/I-CSCF, MGCF, MGW, HSS/HLR, TAS, SLF, BGCF, IBCF, TrGW, SBC) across Sydney Data Centers• Manage and maintain Nokia MSS (Mobile Softswitch) and MSC-S (MSC Server) nodes for CS Core voice• Perform fault management, incident resolution, and root-cause analysis for IMS/CS Core outages• Execute software upgrades, patch management, and capacity expansions on Ericsson/Nokia platforms• Monitor IMS and CS Core KPIs using Grafana, Kalix, Ericsson ENM; resolve degradations proactively• Perform configuration management and provisioning using Ericsson ENM and OneFM• Develop and review MOPs for change management and maintenance windows• Collaborate with PS CORE, Fixed Voice, VAS, and NOC teams on cross-domain incidents• Provide Level 3 support and vendor TAC escalation management (Ericsson and Nokia)• Maintain accurate network documentation and knowledge-base articles
You will bring
Education and experience• Education: Bachelor's in Telecom, Electronics, Computer Science or equivalent• Experience: 15+ years CS Core/IMS - hands-on Ericsson IMS and Nokia MSS/MSC-S
Mandatory technical skills• Ericsson: P/S/I-CSCF, MGCF/MGW, HSS, TAS, SBC• Nokia: MSS, MSC-S
Tool knowledge• Grafana• Kalix• Ericsson ENM• OneFM• ITSM / ServiceNow• Unix / Linux CLI
Protocol and technology knowledge• SIP / SIP-I• Diameter• MAP / CAP• ISUP / SS7• H.248 / MEGACO• SIGTRAN• RTP / RTCP• VoLTE / VoWiFi• IPv4 / IPv6• SCTP
Node types and platforms• Ericsson - P/S/I-CSCF: IMS Call Session Control Functions - proxy, serving, interrogating CSCF• Ericsson - MGCF / MGW: Media Gateway Control Function / Media Gateway - PSTN-IMS interworking• Ericsson - HSS / HLR: Home Subscriber Server / Home Location Register - subscriber data management• Ericsson - TAS: Telephony Application Server - VoLTE/VoWiFi call features and supplementary services• Ericsson - SLF / BGCF: Subscription Locator Function / Breakout Gateway Control Function• Ericsson - IBCF / TrGW: Interconnection Border Control Function / Transition Gateway - IMS peering• Ericsson - SBC: Session Border Controller - SIP trunking, border security, media transcoding• Nokia - MSS: Mobile Softswitch Server - CS voice call control, mobility management• Nokia - MSC-S: Mobile Switching Centre Server - CS domain switching and handover control
Additional advantages and requirements• Added advantage: Good understanding of 5G VoNR and CS Core/IMS Core KPIs, with ability to interpret and act on IMS performance degradation trends• Right to Work: Full right to work in Australia; Sydney-based or relocating
Why join Ericsson?At Ericsson, you'll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what's possible. To build solutions never seen before to some of the world's toughest problems. You'll be challenged, but you won't be alone. You'll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.
What happens once you apply? Click Here to find all you need to know about what our typical hiring process looks like.Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer. learn more.
Primary country and city: Australia (AU) || Sydney
Req ID: 788218
Skills Required
- Bachelor's degree in Telecom, Electronics, Computer Science or equivalent
- 15+ years hands-on CS Core/IMS experience with Ericsson IMS and Nokia MSS/MSC-S
- Experience operating Ericsson IMS nodes (P/S/I-CSCF, MGCF, MGW, HSS, TAS, SLF, BGCF, IBCF, TrGW, SBC)
- Experience managing Nokia MSS and MSC-S nodes for CS Core voice
- Protocol knowledge: SIP / SIP-I, Diameter, MAP / CAP, ISUP / SS7, H.248 / MEGACO, SIGTRAN, RTP / RTCP, SCTP
- VoIP/IMS domain experience: VoLTE, VoWiFi (understanding and troubleshooting)
- Tool knowledge: Ericsson ENM, OneFM, Grafana, Kalix, ITSM/ServiceNow
- Unix / Linux command-line proficiency
- Experience with software upgrades, patch management, capacity expansions, and MOP development for change management
- Experience performing fault management, root-cause analysis, and Level 3 vendor TAC escalation (Ericsson/Nokia)
- Maintain accurate network documentation and knowledge-base articles
- Right to work in Australia and Sydney-based or willing to relocate
- Good understanding of 5G VoNR and CS Core/IMS KPIs (advantage)
What the Team is Saying
.png)
.png)
Ericsson Compensation & Benefits Highlights
-
Healthcare Strength — Health coverage is described as broad and reliable, with multiple medical plan choices, dental/vision, and mental-health/EAP resources. Available descriptions highlight healthcare and disability insurance as consistent strengths.
-
Retirement Support — U.S. materials point to an automatic company 401(k) contribution plus matching that can add up to a notably high employer contribution, and some regions also offer pension options. This structure is often cited as a meaningful component of total rewards.
-
Leave & Time Off Breadth — Time-off programs are characterized as generous, with sizable vacation allowances, paid holidays, sick time, volunteer time, and strong parental leave in some locations. PTO is frequently highlighted as a standout element of the package.
Ericsson Insights
What We Do
Ericsson builds the digital connectivity the world relies on. Our technology underpins the mobile networks, platforms, and systems that billions of people, businesses, and societies depend on every day. We are a global leader in communications technology, delivering mobile network infrastructure, cloud software, and wireless connectivity solutions for service providers and enterprises worldwide. Our networks support connectivity across 180+ countries, helping power everyday communication as well as critical digital services at global scale. Connectivity has evolved far beyond consumer mobile use. Today, nearly 80% of the world’s population accesses the internet via mobile networks, and Ericsson is helping shape what comes next. We are advancing 5G and 5G Advanced, developing network APIs that open connectivity to the global developer ecosystem, and applying automation and AI to make networks more intelligent, efficient, and resilient. Ericsson was the first company to launch live 5G networks on five continents, and our 5G platform is now commercially live in 150+ networks across 60+ countries. We also support more than 36,000 enterprise customers, enabling secure, high-performance connectivity for industries such as manufacturing, aviation, logistics, utilities, and public safety, where reliability and performance are mission critical. Innovation is central to how we work. Ericsson has approximately 28,000 employees in research and development, backed by one of the strongest intellectual property portfolios in the industry with 60,000+ granted patents. Our engineers, researchers, and technologists work across 100+ global R&D sites, helping define how networks evolve and how digital infrastructure is built for the long term. As the world moves toward a mobile-first, AI-powered, and cloud-driven future, connectivity becomes the foundation for digital transformation across every industry. Ericsson is building that foundation, shaping the future of digital connectivity through technology that operates at global scale and supports real-world impact, today and for what comes next.
Why Work With Us
Ericsson is a place for people who want to work on technology that powers everyday life. You’ll contribute to large-scale systems used every day, tackle complex challenges in live environments, and keep developing your skills and career in your own vision.
Gallery
.jpg)
.jpg)
.jpg)
.jpg)
.jpg)
Ericsson Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
Ericsson adopts a hybrid work model globally because we know balance matters. Sometimes things are better in real life. Other times we can be more productive at home. Our hybrid approach gives you the best of both worlds.
