Job Description

About This Prospect n
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Ericsson is seeking a highly skilled MS Core Cloud Specialist – CS Core

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- 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.
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nJoin our Team n
nAbout This Opportunity n
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Ericsson is seeking a highly skilled MS Core Cloud Specialist – CS Core

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- 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.
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nWhat you will do n
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- Operate and maintain Ericsson IMS nodes (P/S/I-CSCF, MGCF, MGW, HSS/HLR, TAS, SLF, BGCF, IBCF, TrGW, SBC) across Sydney Data Centers
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- Manage and maintain Nokia MSS (Mobile Softswitch) and MSC-S (MSC Server) nodes for CS Core voice
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- Perform fault management, incident resolution, and root-cause analysis for IMS/CS Core outages
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- Execute software upgrades, patch management, and capacity expansions on Ericsson/Nokia platforms
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- Monitor IMS and CS Core KPIs using Grafana, Kalix, Ericsson ENM; resolve degradations proactively
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- Perform configuration management and provisioning using Ericsson ENM and OneFM
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- Develop and review MOPs for change management and maintenance windows
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- Collaborate with PS CORE, Fixed Voice, VAS, and NOC teams on cross-domain incidents
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- Provide Level 3 support and vendor TAC escalation management (Ericsson and Nokia)
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- Maintain accurate network documentation and knowledge-base articles
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nYou will bring n
nEducation and experience n
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- Education: Bachelor’s in Telecom, Electronics, Computer Science or equivalent
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- Experience: 15+ years CS Core/IMS — hands‑on Ericsson IMS and Nokia MSS/MSC-S
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nMandatory technical skills n
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- Ericsson: P/S/I-CSCF, MGCF/MGW, HSS, TAS, SBC
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- Nokia: MSS, MSC-S
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nTool knowledge n
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- Grafana
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- Kalix
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- Ericsson ENM
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- OneFM
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- ITSM / ServiceNow
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- Unix / Linux CLI
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nProtocol and technology knowledge n
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- SIP / SIP-I
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- Diameter
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- MAP / CAP
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- ISUP / SS7
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- H.248 / MEGACO
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- SIGTRAN
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- RTP / RTCP
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- VoLTE / VoWiFi
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- IPv4 / IPv6
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- SCTP
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nNode types and platforms n
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- Ericsson – P/S/I-CSCF: IMS Call Session Control Functions — proxy, serving, interrogating CSCF
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- Ericsson – MGCF / MGW: Media Gateway Control Function / Media Gateway — PSTN-IMS interworking
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- Ericsson – HSS / HLR:



Home Subscriber Server / Home Location Register — subscriber data management
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- Ericsson – TAS: Telephony Application Server — VoLTE/VoWiFi call features and supplementary services
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- Ericsson – SLF / BGCF: Subscription Locator Function / Breakout Gateway Control Function
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- Ericsson – IBCF / TrGW: Interconnection Border Control Function / Transition Gateway — IMS peering
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- Ericsson – SBC: Session Border Controller — SIP trunking, border security, media transcoding
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- Nokia – MSS: Mobile Softswitch Server — CS voice call control, mobility management
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- Nokia – MSC-S: Mobile Switching Centre Server — CS domain switching and handover control
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nAdditional Advantages And Requirements n
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- Added advantage: Good understanding of 5G VoNR and CS Core/IMS Core KPIs, with ability to interpret and act on IMS performance degradation trends
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- Right to Work: Full right to work in Australia; Sydney-based or relocating
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nWhy join Ericsson? n
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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.

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nPrimary country and city: n
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Australia (AU) || Sydney

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📌 MS Core Cloud Specialist CS and (New South Wales)
🏢 Ericsson
📍 New South Wales