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:

Positive 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? 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.

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.

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📌 Ms Core Cloud Specialist Cs And Ims-1 (Haymarket)
🏢 Ericsson
📍 Haymarket