MS Core Cloud Specialist CS and IMS - 2

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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.

Primary country and city: Australia (AU) || Sydney

Req ID: 788219