VoIP​/SIP Network Support Engineer

Job Title:
VoIP / SIP Network Support Engineer

Long-term Contract Opportunity
No Sponsorship
Location:
Onsite, Plano, TX


Overview

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.

Required Qualifications:

Experience with Ribbon PSX, Neustar.

Experience with industry-leading Client platforms (Cisco, Ribbon/Sonus, Oracle/Acme Packet, Audio Codes)
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, including G.711, G.729, Opus, and DTMF methods
Familiarity with Clients and SIP trunking architectures

Experience with secure signaling and media, including TLS/mTLS and 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:
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 Client 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