Remote Senior Telephony & VoIP Engineer

Retell AI Inc.; United States; Remote; USD 67,000 - 84,000; Part time

Job summary

Retell AI is seeking a Telephony Engineer to own complex SIP integrations and act as the first line of defense for enterprise telephony support in a remote US role. You will impact call quality, reliability, and customer experience while helping define the AI voice infrastructure standards.

Responsibilities include troubleshooting SIP/RTP, collaborating with customers, and driving improvements based on technical feedback from enterprise clients.

Qualifications

• 5+ years in Telephony/VoIP engineering or equivalent
• Deep understanding of SIP signaling (RFC 3261) and RTP debugging
• Strong networking fundamentals (TCP/IP/TLS, DNS, firewalls)
• Experience with CPaaS/cloud communications (Twilio, Telnyx, etc.)
• Ability to write/modify scripts to automate troubleshooting tasks

Responsibilities

• Own integration work with complex SIP setups across CCaaS/CPaaS platforms
• Troubleshoot call failures using PCAPs, SIP traces, and logs to improve reliability
• Serve as the primary technical contact for enterprise post-onboarding support
• Translate customer feedback into actionable product improvements

Skills

Telephony Eng

VoIP

SIP Protocol

Networking basics

CPaaS platforms

Scripting (Python/Bash/JS)

Tools

PCAP analysis

SIP traces

Job description

Retell AI is seeking a Telephony Engineer to own complex SIP integrations and act as the first line of defense for enterprise telephony support in a remote US role. You will impact call quality, reliability, and customer experience while helping define the AI voice infrastructure standards.

Responsibilities include troubleshooting SIP/RTP, collaborating with customers, and driving improvements based on technical feedback from enterprise clients.