Interactive Resources - iR
Telecommunications Engineer (Denver)
Interactive Resources - iR, Denver, Colorado, United States, 80285
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
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