Job Description

Optus is an Australian telecommunications company, delivering more than 11 million services to our customers every day across mobile, broadband and digital solutions.

What You’ll Do n

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- Operate and maintain Ribbon Fixed Voice nodes, including DMS300, CS2000 (CS2K), C20, SBC, PSX, IN and associated sub-elements.
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- Provide Level 2 fault management, incident resolution and technical support for Fixed Voice platform outages, service degradations and complex operational issues in line with ITIL best practices.
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- Manage escalated and complex customer-related faults across Enterprise and Wholesale environments.
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- Perform structured fault diagnosis and root-cause analysis, identifying corrective actions and validating the effectiveness of permanent remediation.
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- Configure and manage C20 elements, including GWC, SP2K, G9, MAS, SST, SSL/SESM/A2, CBM, CMT, IEMS, MG15K and NDM.
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- Manage SIP trunking, routing and policy rules through Ribbon NMS, including SIP/TDM interworking and service validation.
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- Investigate voice network faults using SIP, INAP, Diameter, RTP and C7/ISUP protocols, together with OSIX and Wireshark.
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- Execute software upgrades, patch management and planned maintenance on Ribbon platforms, including implementation, testing, rollback and post-change verification.
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- Monitor Fixed Voice network KPIs using Grafana and Kalix, proactively addressing degradation trends affecting call completion, ASR, NER and MOS.
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- Develop, review and maintain Methods of Procedure, implementation plans, risk assessments, technical change records, network documentation and knowledge articles.
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- Collaborate with Network Operations, Engineering, Service Management, NOC, Network Enablement & AI Ops, vendors and suppliers to restore services, improve reliability and support the transformation and rationalisation of Network Operations tooling.
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What You Bring nn
- 15+ years of wireline or Fixed Voice telecommunications experience,



with hands‑on operational experience across Ribbon or GENBAND platforms.
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- Deep technical expertise in CS2000 (CS2K), C20 and SBC platforms, including call control, provisioning, trunk management, signalling configuration and fault resolution.
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- Strong operational knowledge of Ribbon Fixed Voice architectures and SBC platforms, including SIP trunking, media policy and SIP/TDM interworking.
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- Advanced knowledge of SIP, SS7/ISUP, SIGTRAN, TDM E1/PRI, RTP/RTCP, G.711/G.729, DTMF, LNP/ENUM and IPv4/IPv6.
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- Practical experience with Grafana, Kalix/OSIX, Wireshark, Ribbon EMS/RAMP, ServiceNow or equivalent ITSM platforms, and Unix/Linux command‑line tools.
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- Ability to interpret Fixed Voice KPIs, including call completion rate, ASR, NER and MOS, and act on emerging degradation trends.
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- Proven experience in incident management, root‑cause analysis, planned maintenance, software upgrades, patching, MOP development, change governance and vendor TAC engagement.
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- A Bachelor’s degree in Telecommunications, Electronics, Computer Science or equivalent experience. Ribbon certifications, CCNA/CCNP Voice and ITIL v4 Foundation are preferred.
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- Knowledge of observability, operational analytics, automation and safe AI‑assisted operations is desirable.
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- Strong technical ownership, accountability and a disciplined approach to operational risk, with the ability to communicate complex issues clearly to technical and non‑technical stakeholders in high‑pressure incident, outage and escalation environments.
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The good stuff… nn
- Competitive remuneration and employee discounts. Make life easier (and more affordable)



with $80 monthly credit and 25% off Optus products and unique shopping discounts with our retail partners.
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- Flexible working arrangements with opportunities to work three days in the office, two days remote or home.
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- Vibrant and cooperative office campus that includes cafes, convenience store, chill out zones, GP, post office, gym and on‑site childcare centre.
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- Competitive leave policies, including additional 'Connected’ days to focus on culture, family, health, community, or whatever’s important to you.
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- We support growing families with inclusive, carer‑neutral paid Parental Leave of up to 16 weeks.
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- Build meaningful connections through employee‑led networks and diversity initiatives including Culture Connect, Elevate Women, Disability Network and Express Yourself (LGBTQIA+).
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- Put your wellbeing first with free access to counselling and support services, 24/7 — in‑person, by phone, SMS, or video.
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- Free Optus bus from Macquarie University Metro Station (every 6‑8 minutes); morning and afternoon.
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At Optus, we are strengthened by others and that means valuing diversity and saying ‘yes’ to embracing individual differences.

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We are committed to ensuring that our application process provides an equal employment opportunity to all job seekers, including individuals from diverse gender, cultural and linguistic backgrounds, individuals with a disability, individuals identifying as being part of the LGBTQIA+ community, individuals who may have served in the armed forces or who identify as Aboriginal and/or Torres Strait Islander.

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We also want to do our best to make our recruitment process inclusive.

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If you require any adjustments or accessibility support to participate fairly and equitably in the recruitment process, please email or call .

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about/inclusion-diversityFor more information on Diversity, Inclusion & Belonging at Optus, please visit about/inclusion-diversity

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📌 Technical Specialist, Fixed Voice (Sydney)
🏢 Optus
📍 Sydney