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
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.
What happens once you apply? Click Here to find all you need to know about what our typical hiring process looks like.Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer. learn more.
Primary country and city: Australia (AU) || Sydney
Req ID: 788202
Skills Required
- Bachelor's degree in Telecom, Electronics, Computer Science or equivalent
- 15+ years hands-on Wireline/Fixed Voice experience on Ribbon or GENBAND platforms
- Deep expertise in DMS100, CS2000 (CS2K), and C20 platform elements
- Operational knowledge of Ribbon/GENBAND Fixed Voice architectures and SBC platforms
- Experience operating and provisioning Ribbon / Nortel DMS100, GENBAND CS2000/CS2K, and C20 sub-elements
- Experience with SBC provisioning, SIP trunking and policy rules via Ribbon NMS
- Tool experience: Grafana, Kalix, Ribbon NMS, ServiceNow/ITSM, Unix/Linux CLI
- Protocol 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
- Ability to perform fault management, root-cause analysis, software upgrades, patch management and planned maintenance on GENBAND/Ribbon platforms
- Experience monitoring network KPIs and acting on KPI degradation trends
- Ribbon/GENBAND certifications and CCNA/CCNP Voice
- Full right to work in Australia and Sydney-based or willing to relocate
What the Team is Saying
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Ericsson Compensation & Benefits Highlights
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Healthcare Strength — Health coverage options are described as broad, with multiple medical plan choices (often three) plus dental and mental health resources. U.S. materials also reference PPO and HDHP options, and some teams contribute to HSAs.
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Retirement Support — U.S. postings outline a 401(k) with an automatic 3% company contribution plus matching that reaches 4% when employees contribute 5%. This combination is repeatedly listed in role postings and characterized as strong for the sector.
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Parental & Family Support — U.S. job descriptions frequently cite up to 16 weeks paid maternity leave and 6 weeks paid parental/adoption leave at 100% pay. These benefits are positioned as exceeding many U.S. corporate policies.
Ericsson Insights
What We Do
Ericsson builds the digital connectivity the world relies on. Our technology underpins the mobile networks, platforms, and systems that billions of people, businesses, and societies depend on every day. We are a global leader in communications technology, delivering mobile network infrastructure, cloud software, and wireless connectivity solutions for service providers and enterprises worldwide. Our networks support connectivity across 180+ countries, helping power everyday communication as well as critical digital services at global scale. Connectivity has evolved far beyond consumer mobile use. Today, nearly 80% of the world’s population accesses the internet via mobile networks, and Ericsson is helping shape what comes next. We are advancing 5G and 5G Advanced, developing network APIs that open connectivity to the global developer ecosystem, and applying automation and AI to make networks more intelligent, efficient, and resilient. Ericsson was the first company to launch live 5G networks on five continents, and our 5G platform is now commercially live in 150+ networks across 60+ countries. We also support more than 36,000 enterprise customers, enabling secure, high-performance connectivity for industries such as manufacturing, aviation, logistics, utilities, and public safety, where reliability and performance are mission critical. Innovation is central to how we work. Ericsson has approximately 28,000 employees in research and development, backed by one of the strongest intellectual property portfolios in the industry with 60,000+ granted patents. Our engineers, researchers, and technologists work across 100+ global R&D sites, helping define how networks evolve and how digital infrastructure is built for the long term. As the world moves toward a mobile-first, AI-powered, and cloud-driven future, connectivity becomes the foundation for digital transformation across every industry. Ericsson is building that foundation, shaping the future of digital connectivity through technology that operates at global scale and supports real-world impact, today and for what comes next.
Why Work With Us
Ericsson is a place for people who want to work on technology that powers everyday life. You’ll contribute to large-scale systems used every day, tackle complex challenges in live environments, and keep developing your skills and career in your own vision.
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