Troubleshoot SIP signaling, RTP media flow, one-way/no-audio issues, codec negotiation, jitter, latency, packet loss, and NAT traversal problems
Perform advanced VoIP and network troubleshooting using tools like sngrep, tcpdump, Wireshark, RTP analysis, traceroute, ping, and network monitoring tools
Design, develop, and maintain scalable VoIP and telephony solutions using Asterisk and/or FreeSWITCH
Configure and manage SIP trunking, dial plans, IVR systems, call routing, conferencing, and PBX features
Develop and optimize real-time voice communication systems for high availability and low latency
Integrate telephony systems with CRMs, APIs, third-party services, and AI-based voice platforms
Troubleshoot SIP signaling, RTP media flow, NAT traversal, codec negotiation, and call quality issues
Implement and maintain WebRTC-based communication solutions and SIP over WebSocket (WSS)
Develop custom modules, AGI/ESL scripts, and automation tools for telephony workflows
Monitor system performance, identify bottlenecks, and optimize server scalability and reliability
Work with DevOps and infrastructure teams for deployment, monitoring, and production support
Participate in requirement analysis, architecture planning, estimation, and technical documentation
Mentor junior developers and support technical decision-making across VoIP projects
Ensure system security, failover mechanisms, and compliance with communication standards
Strong hands-on experience with Asterisk, FreeSWITCH, FusionPBX, or FreePBX
Deep understanding of SIP, RTP, SRTP, WebRTC, ICE, STUN/TURN, and NAT traversal
Experience in configuring SIP trunks, SBCs, gateways, IVRs, queues, and call center solutions
Proficiency in scripting/programming using Python, Lua, PHP, Node.js, or Bash
Experience with ESL (Event Socket Library), AGI, AMI, or ARI integrations
Knowledge of VoIP troubleshooting tools such as sngrep, tcpdump, Wireshark, and RTP analysis
Experience with Linux server administration (Ubuntu/CentOS/Debian)
Familiarity with Kamailio/OpenSIPS and SIP proxy concepts is a plus
Experience integrating telephony with cloud providers like Twilio, Telnyx, Plivo, or similar
Knowledge of databases such as MySQL/PostgreSQL and API integrations
Understanding of containerization and deployment using Docker/Kubernetes is preferred
Familiarity with CI/CD and monitoring tools for production systems
