VoIP / SIP Network Support Engineer

Job Title: VoIP / SIP Network Support EngineerLong-term Contract OpportunityNo SponsorshipLocation: Onsite, Plano, TXOverviewWe 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, AudioCodes)Strong hands on experience troubleshooting SIP and VoIP in carrier or enterprise environmentsAbility to analyze SIP call flows, packet captures, and signaling logsSolid understanding of telecom network behavior , including call routing and failure scenariosExperience with monitoring systems, alert response, and incident triageWorking 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 methodsFamiliarity with Clients and SIP trunking architecturesExperience with secure signaling and media , including TLS/mTLS and SRTPProven discipline in incident management, escalation, and follow throughExcellent verbal and written communication skills, especially during high severity incidentsPreferred Skills :Exposure to automation tools (e.g., Ansible, Python scripting).Experience working with telecom carriers or managed voice service providersExposure to packet capture tools (e.g., Wireshark) and call analysis platformsExperience supporting 24x7 or on call production environmentsResponsibilities:Troubleshoot complex SIP and VoIP issues impacting call setup, call quality, and service availabilityAnalyze SIP signaling flows, call traces, and logs to identify root causes and failure patternsMonitor alerts, respond to incidents, and perform real time issue triage in a production environmentInvestigate RTP/media path issues , including jitter, packet loss, latency, QoS, and MOS degradationValidate and troubleshoot SDP negotiations , codec selection, DTMF methods, and media compatibilitySupport and coordinate Client and SIP trunk operations , including interop issues with carriers and vendorsWork with secure voice implementations using TLS/mTLS for signaling and SRTP for mediaParticipate in incident management and escalation processes , ensuring proper ownership and resolutionProvide clear, concise incident communications to internal stakeholders, leadership, and external vendorsContribute to post incident reviews, documentation, and operational improvements