L3 Network Engineer

Provide L3 escalation support as the Voice/VoIP subject matter expert; install, configure, troubleshoot, and maintain ISDN PRI and SIP CPEs, voice gateways, ESBCs, and their NMS/EMS platforms Lead technical projects for new systems and upgrades; run POCs, interoperability testing, and integrations with third-party communication platforms Work with backend teams, vendors, and IT to resolve customer issues; manage vendor relationships and SLAs Perform scheduled maintenance, tuning, and firmware security checks; follow Incident and Change Management processes; document support procedures for audit Support capital budget planning (BOM/BOQ) and cost optimization; provide after-hours on-call support Requirements Bachelor's Degree in Computer Science, Electronics & Telecommunication, or IT CCIE / CCNP Collaboration certification (mandatory) 7+ years supporting Cisco IPT or similar platforms — UCCE/UCCX, voice gateways, ESBCs, Cisco HCS, and v.

Center/v. Sphere Strong knowledge of ISDN PRI, E1/T1, SIP, VoIP, H.323, RTP; hands-on with Ribbon and Nuera ESBCs/gateways and Teams Direct Routing Deep-dive troubleshooting using SIP captures, call traces, and CDRs; knowledge of dial plans, trunks, DIDs, and call routing; basic Linux (RHEL/CentOS) ITIL and Project Management knowledge; contact center experience is an advantage