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.

Join our Team

About This Chance

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: Valuable 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.

Primary country and city:

Australia (AU) || Sydney

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📌 MS Core Cloud Specialist CS and (City of Sydney)
🏢 Ericsson
📍 City of Sydney