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MS Core Cloud Specialist CS and IMS-2

Ericsson -
Sydney NSW

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Job Details

3 days ago

Qualifications

Computer science
5G
Education
Bachelor's degree
ServiceNow

Full Job Description

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: 788219

Apply Now

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