Fixed Voice Network Specialist – Observability & Automation

Optus; Sydney; Hybrid; AUD 150,000 - 190,000; Full time

Benefits offered by this job

Flexible working

Office campus amenities

Parental leave support

Employee discounts

Counselling services

Job summary

Optus seeks a Technical Specialist, Fixed Voice to operate and maintain the Fixed Voice network across Ribbon platforms, ensuring high availability and performance. You will contribute to modernization and automation while supporting enterprise and wholesale services.

You will lead fault management, incident resolution and software upgrades, monitor KPIs with Grafana, and collaborate with NOC, Engineering and vendors. A strong CS2K/C20/SBC background and ITIL experience are essential.

Qualifications

• 15+ years of wireline or Fixed Voice telecommunications experience across Ribbon or GENBAND platforms.
• Deep technical expertise in CS2000 (CS2K), C20 and SBC platforms with call control, provisioning and fault resolution.
• Strong knowledge of Ribbon Fixed Voice architectures, SIP trunking and SIP/TDM interworking.
• Advanced knowledge of SIP, SS7/ISUP, SIGTRAN, TDM E1/PRI, RTP/RTCP, G.711/G.729, DTMF, LNP/ENUM and IPv4/IPv6.
• Experience with Grafana, Kalix/OSIX, Wireshark, Ribbon EMS/RAMP, ServiceNow or ITSM tools, and Unix/Linux CLI.
• Ability to interpret Fixed Voice KPIs (call completion, ASR, NER, MOS) and act on degradation trends.
• Proven incident management, root-cause analysis and vendor TAC engagement.
• Bachelor’s degree and Ribbon certifications; ITIL v4 preferred.

Responsibilities

• Operate and maintain Ribbon Fixed Voice nodes and associated sub-elements.
• Provide Level 2 fault management and incident resolution for Fixed Voice outages.
• Manage escalated faults across Enterprise and Wholesale environments.
• Perform root-cause analysis and validate permanent remediation.
• Configure C20 elements and SIP/TDM interworking.
• Manage SIP trunking, routing, and policy rules via Ribbon NMS.
• Investigate voice faults using SIP/ISUP protocols and OSIX/Wireshark.
• Execute software upgrades, patches, changes, and post-change verification.
• Monitor Fixed Voice KPIs using Grafana and Kalix to address degradation trends.
• Develop and maintain MOPs, risk assessments, and network documentation.
• Collaborate across NOC, Engineering, Service Management and vendors.

Skills

Fault management

Level 2 support

SIP/TDM interworking

SIP trunking

Incident management

Troubleshooting

Vendor engagement

Operational analytics

Communication under pressure

Education

Bachelor’s degree in Telecommunications, Electronics, Computer Science or equivalent

Ribbon certifications

CCNA/CCNP Voice

ITIL v4 Foundation

Tools

Ribbon EMS/RAMP

ServiceNow

Unix/Linux CLI

Kalix/OSIX

Wireshark

Grafana

Job description

Optus seeks a Technical Specialist, Fixed Voice to operate and maintain the Fixed Voice network across Ribbon platforms, ensuring high availability and performance. You will contribute to modernization and automation while supporting enterprise and wholesale services.

You will lead fault management, incident resolution and software upgrades, monitor KPIs with Grafana, and collaborate with NOC, Engineering and vendors. A strong CS2K/C20/SBC background and ITIL experience are essential.