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Telecommunications Engineer
Telecommunications EngineerInteractive Resources - iR • Denver, Colorado, United States
Telecommunications Engineer

Telecommunications Engineer

Interactive Resources - iR • Denver, Colorado, United States
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Senior VoIP Specialist

Location : Denver - Hybrid – Onsite Tuesday–Thursday, Remote Monday & Friday

Employment Type : Full-Time (Consulting option available)

Position Summary

We’re seeking a Senior VoIP Specialist to serve as the technical lead for enterprise voice systems supporting one of our largest telecommunications clients. This role requires a hands-on expert in VoIP, SIP, and call center telephony who can troubleshoot complex issues, optimize performance, and guide the evolution of our voice infrastructure.

You’ll operate in a large-scale Avaya environment (20,000+ endpoints) while helping shape the future of our telephony platform. This position offers both stability and growth in a collaborative, low-turnover team known for its technical excellence and strong culture.

Key Responsibilities

  • Act as the subject matter expert (SME) for all enterprise VoIP and SIP technologies.
  • Lead troubleshooting and resolution for complex VoIP / SIP and call center issues across large-scale environments.
  • Configure, maintain, and optimize SIP trunks, call routing, and QoS policies for voice traffic.
  • Support and enhance Avaya systems (Communication Manager, Session Manager, SBC) and assist in future migrations or upgrades.
  • Collaborate with network and infrastructure teams to ensure system reliability, uptime, and voice quality.
  • Interface with service providers (including Comcast) for escalations, configuration changes, and performance improvements.
  • Develop technical documentation, knowledge base articles, and standard operating procedures.
  • Mentor junior staff and provide guidance on advanced troubleshooting and best practices.
  • Contribute to roadmap planning and recommendations for new voice technologies and integrations.

Required Qualifications

  • 5+ years of progressive experience supporting or engineering VoIP / SIP systems in enterprise environments.
  • Strong understanding of SIP protocols (RFC 3261 and extensions), call flows, and signaling.
  • Hands-on experience with Avaya platforms or equivalent systems (Cisco, Asterisk, Microsoft Teams Phone).
  • Advanced troubleshooting experience with tools such as Wireshark, SIP debuggers, and VoIP analyzers.
  • Solid understanding of QoS, SIP trunking, codec negotiation, and NAT / firewall traversal.
  • Proven ability to manage and support environments with 10,000+ endpoints.
  • Excellent communication skills and ability to interact effectively with both technical and non-technical stakeholders.

    • Preferred Qualifications

  • Experience with call center solutions or voice endpoint integration .
  • Familiarity with cloud-based or hybrid VoIP environments.
  • Scripting experience (Python, PowerShell, or Bash) for automation or monitoring.
  • Certifications such as Avaya Certified Implementation Specialist , Cisco CCNP Collaboration , or CompTIA Network+ .

    • Why Join Us

  • 100% employer-paid healthcare coverage
  • Fully funded Health Savings Account (HSA)
  • 401(k) match to the maximum allowed
  • Stable, collaborative team with low turnover
  • Opportunity to make an immediate impact in a highly visible role
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    Engineer • Denver, Colorado, United States

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