MS Core Cloud Specialist CS and IMS-1

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