VoIP Engineer

Carrier Interconnectivity

Test, deploy, and maintain SIP solutions with global carriers to ensure reliability, compliance, and optimal routing.

System Integration

Collaborate with R&D teams to integrate SIP services from SBC edge to custom voice core.

Maintain Voice Infrastructure

• Deploy, Upgrade, and Maintain our Core Voice infrastructure, including our SBC’s and policy servers.
• Serve in an on-call rotation for urgent, high visibility issues.

Work Automation

Build and implement scripts to reduce operational burden, replacing manual workflows.

Documentation

• Maintain "Documentation as Code," including SIP call flow diagrams, as well as troubleshooting and other functional procedures.

Advanced Observability

Act as an escalation point for complex SIP/RTP problems. Use advanced tools like Empirix, Wireshark, SIPp, and HEPIC to analyze call flows and media streams.

Qualifications

• Experience: 2-3 years of hands-on VoIP engineering experience, with a heavy emphasis on carrier-grade SIP environments.
• SIP Mastery: Expert-level knowledge of SIP signaling (INVITE, BYE, etc.), SDP negotiation, and RTP/RTCP.
• Scripting Toolkit: 1-3 years of proficiency in Python, Bash, Ansible, or Github for automating provisioning and troubleshooting workflows.
• VoIP Infrastructure: Hands-on experience with maintaining and upgrading traditional SBCs (i.e. Ribbon), along with familiarity with open-source technologies (e.g., Kamailio, OpenSIPS).
• Diagnostics: Proficiency with diagnostic tools such as Empirix, Wireshark, SIPP, sngrep, and Homer/HEP.
• Bonus Points: Carrier Expertise: Direct experience with carrier-to-carrier SIP interconnects and carrier-grade voice network design.
• Routing & Databases: Experience with Least Cost Routing and complex routing logic.
• Voice Security: Familiarity with TLS, SRTP, and regulatory compliance including STIR/SHAKEN and E911.
• Virtualized Infrastructure: Experience deploying voice services in containerized or cloud-native environments.
• Networking: Solid knowledge of IP, DNS, and routing protocols.