Senior Fixed Voice Engineer: Ribbon/CS2K & SBC Expert

Optus Enterprise; Sydney; Hybrid; AUD 140,000 - 200,000; Full time

Benefits offered by this job

Flexible working arrangements

Office campus on-site facilities

Parental Leave

Counselling services

Employee discounts

Free Optus bus service

Job summary

Optus is seeking a Technical Specialist, Fixed Voice, to operate and maintain Ribbon Fixed Voice infrastructure across multiple platforms. You’ll deliver Level 2 fault management, incident resolution and complex troubleshooting within ITIL-aligned practices.

Collaboration with NOC, engineering and vendors will drive reliability and tooling evolution. Ideal candidates bring 15+ years in Fixed Voice, deep knowledge of CS2K/C20/SBC, SIP trunking, and strong analytics with Grafana/Wireshark.

Qualifications

• Extensive experience in wireline or Fixed Voice telecom environments.
• Hands-on with Ribbon or GENBAND platforms and C20/SBC.
• Experience with fault management, incident resolution and ITIL practices.
• Ability to perform root-cause analysis and implement permanent remediation.
• Bachelor’s degree in a relevant field; Ribbon certifications, CCNA/CCNP Voice and ITIL v4 Foundation preferred.

Responsibilities

• Operate and maintain Ribbon Fixed Voice nodes (DMS300, CS2000, C20, SBC, PSX, IN).
• Provide Level 2 fault management and incident resolution for Fixed Voice outages.
• Manage escalated faults across Enterprise and Wholesale environments.
• Conduct structured fault diagnosis, root-cause analysis and verification.
• Configure C20 elements and SIP/TDM interworking.
• Manage SIP trunking, routing and policy rules via Ribbon NMS.
• Investigate voice faults using SIP, INAP, Diameter, RTP, ISUP; use OSIX/Wireshark.
• Execute software upgrades, patching, maintenance, rollback and post-change verification.
• Monitor KPIs with Grafana and Kalix to address degradation trends (ASR, NER, MOS).
• Develop MOPs, change records, risk assessments and network documentation.
• Collaborate with multiple teams and vendors to restore services and improve tooling.

Skills

Ribbon Fixed Voice

SBC platforms

SIP trunking

ITIL processes

Grafana

Kalix OSIX

Wireshark

ServiceNow / ITSM

Unix/Linux CLI

Incident management

Root cause analysis

Vendor TAC engagement

Education

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

Tools

Grafana

Kalix/OSIX

Wireshark

Ribbon EMS/RAMP

ServiceNow

Unix/Linux

Job description

Optus is seeking a Technical Specialist, Fixed Voice, to operate and maintain Ribbon Fixed Voice infrastructure across multiple platforms. You’ll deliver Level 2 fault management, incident resolution and complex troubleshooting within ITIL-aligned practices.

Collaboration with NOC, engineering and vendors will drive reliability and tooling evolution. Ideal candidates bring 15+ years in Fixed Voice, deep knowledge of CS2K/C20/SBC, SIP trunking, and strong analytics with Grafana/Wireshark.