MS Core Cloud Specialist Fixed Voice

About this opportunity
Ericsson is seeking a highly skilled MS Core Cloud Specialist – Fixed Voice to join our team in Sydney, NSW. This senior role requires deep expertise in Ribbon and GENBAND voice switching platforms to support and evolve Fixed Voice network infrastructure across Australian Data Centers.

What you will do
· Operate and maintain Ribbon/GENBAND Fixed Voice nodes (DMS100, CS2000/CS2K, C20 and sub-elements) across Sydney-based and national Data Centers
· Perform fault management, incident resolution, and root-cause analysis for voice platform outages
· Execute software upgrades, patch management, and planned maintenance on GENBAND/Ribbon platforms
· Configure and manage C20 elements: GWC, CCA, USP/SP2K, AMS, MAS, NGSS/SST, SSL/SESM/A2, CS-LAN, CBM, CMT/IEMT, IEMS, RTP MP EM, PMDM, MG3.5K, MG15K, NDM, TNSI
· Monitor network KPIs using Grafana and Kalix; resolve degradations proactively
· Manage SBC provisioning, SIP trunking, and policy rules via Ribbon NMS
· Develop and review MOPs for change management and maintenance windows
· Collaborate with IMS, PS CORE, and NOC teams on cross-domain incidents
· Provide Level 3 support and escalation management with Ribbon/GENBAND vendor TAC
· 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 Wireline/Fixed Voice — hands-on experience on Ribbon or GENBAND platforms

Mandatory technical skills
· Deep expertise in DMS100, CS2000 (CS2K), and C20 platform elements
· Strong operational knowledge of Ribbon/GENBAND Fixed Voice architectures and SBC platforms

Tool knowledge
· Grafana
· Kalix
· Ribbon NMS
· ServiceNow / ITSM
· Unix / Linux CLI

Protocol and technology knowledge
· SIP (RFC 3261)
· H.248 / MEGACO
· SS7 / ISUP
· SIGTRAN
· TDM E1 / T1 / PRI
· RTP / RTCP
· G.711 / G.729
· DTMF RFC 2833
· LNP / ENUM
· IPv4 / IPv6

Node types and platforms
· Ribbon / Nortel – DMS100: Class 5 wireline switch — operation, provisioning, fault resolution
· GENBAND / Ribbon – CS2000 (CS2K): Softswitch — call control, trunk management, signalling configuration
· GENBAND / Ribbon – C20 Softswitch: GWC, CCA, USP/SP2K, AMS, MAS, NGSS/SST, SSL/SESM/A2, CS-LAN, CBM, CMT/IEMT, IEMS, RTP MP EM, PMDM, MG3.5K, MG15K, NDM, TNSI
· Ribbon – SBC: Session Border Controller — SIP trunking, media policy, SIP/TDM interworking

Additional advantages and requirements
· Added advantage: Good understanding of network KPIs (call completion rate, ASR, NER, MOS) for Fixed Voice, with ability to interpret and act on KPI degradation trends
· Certifications: Ribbon/GENBAND certifications and CCNA/CCNP Voice (preferred)
· Right to Work: Full right to work in Australia; Sydney-based or relocating