Operate, maintain and evolve Ericsson IMS and Nokia CS Core nodes across Sydney data centers. Perform fault management, incident resolution, upgrades, capacity planning, KPI monitoring, configuration/provisioning, change MOP development, Level 3 support and vendor escalation, and maintain documentation and knowledge-base.
Join our Team
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
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
Similar Jobs at Ericsson
Cloud • Information Technology • Internet of Things • Machine Learning • Software • Cybersecurity • Infrastructure as a Service (IaaS)
Lead sales enablement and end-to-end professional services for Mission Critical Networks (MCN). Act as single point of contact for commercial submissions, align integration and division of responsibility with SIs and partners, manage CoE systems and PoCs, develop E2E portfolio readiness, support CFRs on scope, timelines, and approvals, and provide early visibility of customer and SI requirements to inform roadmap and readiness.
Top Skills:
5GAutomationLteMission Critical Networks (Mcn)
Cloud • Information Technology • Internet of Things • Machine Learning • Software • Cybersecurity • Infrastructure as a Service (IaaS)
Leads Ericsson’s strategic engagement with Optus, coordinating executive relationships, cross-domain alignment, account strategy, governance, and strategic deal closure. Develops the partnership narrative across 5G, cloud, AI, autonomous networks, differentiated connectivity, and enterprise growth. Aligns technical, commercial, delivery, and operations leaders to customer outcomes, facilitates executive forums and engagements, and supports the Key Account Manager in strategic account leadership.
Top Skills:
5G6GAIAutonomous NetworksCloudCore NetworksOss/BssRan
Cloud • Information Technology • Internet of Things • Machine Learning • Software • Cybersecurity • Infrastructure as a Service (IaaS)
Deliver network design and optimization services and presales support for global telecom customers. Design complex end-to-end solutions spanning devices, RAN, transport, and packet core, incorporating 4G, 5G, AI/ML, and Cloud-RAN technologies. Improve service, software, and product offerings; translate customer business objectives into network performance improvements; implement solutions within scope, cost, and schedule; manage acceptance; and share technical expertise.
Top Skills:
4G5G Nsa/Sa5G-ACloud-RanMbb/FwaMl/AiPacket CoreRadio Access Network (Ran)Ran Sharing/MocnStatistical AnalysisTransportVolte/Vonr
What you need to know about the Sydney Tech Scene
From opera to comedy shows, the Sydney Opera House hosts more than 1,600 performances a year, yet its entertainment sector isn't the only one taking center stage. The city's tech sector has earned a reputation as one of the fastest-growing in the region. More specifically, its IT sector stands out as the country's third-largest, growing at twice the rate of overall employment in the past decade as businesses continue to digitize their operations to stay competitive.
