MS Core Cloud Specialist CS and IMS-1

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.

Responsibilities

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 and MSC-S 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 and 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

Requirements

Bachelor's in Telecom, Electronics, Computer Science or equivalent; 15+ years CS Core/IMS experience with hands-on Ericsson IMS and Nokia MSS/MSC-S; Ericsson: P/S/I-CSCF, MGCF/MGW, HSS, TAS, SBC; Nokia: MSS, MSC-S; Tools: Grafana, Kalix, Ericsson ENM, OneFM, ITSM / ServiceNow, Unix / Linux CLI; Protocols: SIP / SIP-I, Diameter, MAP / CAP, ISUP / SS7, H.248 / MEGACO, SIGTRAN, RTP / RTCP, VoLTE / VoWiFi, IPv4 / IPv6, SCTP; Right to work: full right to work in Australia; Sydney-based or relocating

Nice to have

Good understanding of 5G VoNR and CS Core/IMS Core KPIs; ability to interpret and act on IMS performance degradation trends