Job Description

Senior VoIP Specialist

Location: Denver - Hybrid Onsite TuesdayThursday, Remote Monday & Friday

Employment Type: Full-Time (Consulting option available)

Position Summary

Were 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.

Youll 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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