MS Core Cloud Specialist CS and IMS-1

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

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.

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