Sr. Network Operations VoIP Engineer

Bandwidth Inc. is a global software company that specializes in voice, messaging, and emergency services. They are seeking a highly skilled Senior VoIP Engineer to join their Network Operations Engineering team, focusing on ensuring reliable and secure SIP connectivity across multiple carrier platforms and enterprise environments.

Responsibilities:

• Conduct detailed interoperability testing between carrier platforms, SBCs, servers, and softswitches; resolve SIP signaling mismatches and codec issues
• Design, configure, and maintain SIP trunking solutions with multiple carriers; ensure reliability, compliance, and optimal call routing
• Act as the highest-level escalation point for complex SIP and RTP problems, including one-way audio, call setup failures, and call feature failures
• Use advanced troubleshooting tools (Wireshark/packet analysis, SIPp, HEPIC, Empirix, etc.) to capture and analyze SIP call flows and media streams
• Collaborate with network and security teams to integrate SIP services through network equipment, SIP proxy servers, and routing policies
• Create automations to reduce operations burden, find ways to automate manual work via scripting, and identify operational inefficiencies
• Partner with internal teams, carriers, and service providers to validate solutions, perform escalations, and ensure SIP trunk functionality
• Create and maintain detailed documentation, including SIP call flow diagrams, carrier interconnect standards, and troubleshooting guides
• Provide guidance and training to junior engineers and operations staff on SIP fundamentals and troubleshooting methodologies

Requirements:

• 7+ years of hands-on VoIP engineering experience, with a strong focus on carrier SIP trunking and interoperability
• Expert-level knowledge of SIP signaling (INVITE, BYE, REGISTER, re-INVITE, UPDATE, PRACK, REFER, etc.), SDP negotiation, RTP/RTCP, and SIP headers
• Proven ability to troubleshoot complex SIP interoperability issues across different carrier platforms and SBCs
• Strong experience with Session Border Controllers (SBCs) and SIP proxies (e.g., Ribbon, AudioCodes, Oracle/Acme Packet, OpenSIPS, Kamailio, etc.)
• Proficiency with diagnostic tools: Wireshark, sngrep, Homer/HEP, SIPp, Empirix, etc
• Solid networking knowledge: IP, DNS, subnetting, VLANs, routing protocols
• Strong Linux administration skills for VoIP applications and troubleshooting
• Excellent written and verbal communication skills
• Direct experience with carrier VoIP platforms and carrier-to-carrier SIP interconnects
• Experience with ENUM, number portability (LNP), routing databases and logic, and SS7-to-SIP interworking
• Familiarity with SIP security (TLS, SRTP), and regulatory compliance (e.g., STIR/SHAKEN, E911, lawful intercept)
• Background in softswitch architecture and VoIP core platforms
• Scripting/automation skills (Python, Bash, Ansible) for provisioning and troubleshooting workflows
• Industry certifications in SIP, SBCs, or carrier VoIP technologies (SSCA®, Ribbon, AudioCodes, Oracle/Acme Packet, etc.)