MS Core Cloud Specialist CS and IMS-2

Ericsson; Sydney; On-site; AUD 180,000 - 260,000; Full time

Job summary

Ericsson in Sydney seeks a highly skilled MS Core Cloud Specialist – CS Core IMS to manage and evolve voice core infrastructure across Australian Data Centers. This senior role requires deep Ericsson IMS stack and Nokia MSS/MSC-S expertise.

You will operate and maintain IMS nodes, manage CS core voice components, and lead fault resolution, upgrades, and change management. Strong collaboration with cross-domain teams is essential.

Qualifications

• Bachelor’s in Telecom, Electronics, Computer Science or equivalent.
• 15+ years CS Core/IMS hands-on with Ericsson IMS and Nokia MSS/MSC-S.

Responsibilities

• Operate and maintain Ericsson IMS nodes across Sydney Data Centers.
• Manage Nokia MSS and MSC-S nodes for CS Core voice.
• Fault management, incident resolution, and root-cause analysis for IMS/CS Core outages.
• Perform software upgrades, patch management, and capacity expansions on Ericsson/Nokia platforms.
• Monitor IMS and CS Core KPIs using Grafana, Kalix, Ericsson ENM; address degradations.
• 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.

Skills

Ericsson IMS

Nokia MSS/MSC-S

Grafana

Kalix

Ericsson ENM

OneFM

Education

Bachelor’s in Telecom, Electronics, Computer Science or equivalent

Tools

Ericsson ENM

OneFM

Grafana

Kalix

Job description

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

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