Senior Network Engineer (VoIP / SIP Network Support Engineer) at Lumiere Systems

Plano, Texas, United States -

Full Time

Start Date

Immediate

Expiry Date

11 Jul, 26

Salary

0.0

Posted On

12 Apr, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

VoIP, SIP, Network Troubleshooting, SBC, RTP, QoS, Packet Capture, Signaling Analysis, Incident Management, Ribbon PSX, Neustar, Cisco, Oracle, AudioCodes, TLS, SRTP

Industry

IT Services and IT Consulting

Description

We are seeking a highly skilled VoIP / SIP Network Support Engineer to support and troubleshoot real-time voice services in a production telecom environment. This role focuses on rapid incident triage, deep SIP and media analysis, and effective coordination with internal teams and external vendors to ensure high service availability and call quality. The ideal candidate has hands-on experience analyzing SIP signaling and media flows, understands telecom network behavior, and communicates clearly during high-severity incidents. Key Responsibilities * Troubleshoot complex SIP and VoIP issues impacting call setup, call quality, and service availability * Analyze SIP signaling flows, call traces, and logs to identify root causes and failure patterns * Monitor alerts, respond to incidents, and perform real-time issue triage in a production environment * Investigate RTP/media path issues, including jitter, packet loss, latency, QoS, and MOS degradation * Validate and troubleshoot SDP negotiations, codec selection, DTMF methods, and media compatibility * Support and coordinate SBC and SIP trunk operations, including interop issues with carriers and vendors * Work with secure voice implementations using TLS/mTLS for signaling and SRTP for media * Participate in incident management and escalation processes, ensuring proper ownership and resolution * Provide clear, concise incident communications to internal stakeholders, leadership, and external vendors * Contribute to post-incident reviews, documentation, and operational improvements Required Qualifications: * Experience with Ribbon PSX, Neustar * Experience with industry-leading SBC platforms (Cisco, Ribbon/Sonus, Oracle/Acme Packet, AudioCodes) * Strong hands-on experience troubleshooting SIP and VoIP in carrier or enterprise environments * Ability to analyze SIP call flows, packet captures, and signaling logs * Solid understanding of telecom network behavior, including call routing and failure scenarios * Experience with monitoring systems, alert response, and incident triage * Working knowledge of RTP and media fundamentals (jitter, packet loss, QoS, MOS) * Strong understanding of SDP and codecs (G.711, G.729, Opus, DTMF) * Familiarity with SBCs and SIP trunking architectures * Experience with secure signaling and media (TLS/mTLS, SRTP) * Proven discipline in incident management, escalation, and follow-through * Excellent verbal and written communication skills, especially during high-severity incidents Preferred Skills * Exposure to automation tools (e.g., Ansible, Python scripting) * Experience working with telecom carriers or managed voice service providers * Exposure to packet capture tools (e.g., Wireshark) and call analysis platforms * Experience supporting 24x7 or on-call production environments

Responsibilities

The role involves troubleshooting complex SIP and VoIP issues to ensure high service availability and call quality in a production environment. You will perform real-time incident triage, analyze signaling flows, and coordinate with internal teams and vendors to resolve technical failures.