The Seo Byte - Telephony Engineer - FreeSWITCH/VoIP

Roles & Responsibilities: We are looking for a FreeSWITCH Implementation Engineer who will be responsible for designing, deploying, configuring, integrating, and maintaining FreeSWITCH-based VoIP platforms. The role involves working closely with SIP, RTP, WebRTC, IVR, conferencing, call routing, and external integrations in a production environment. Key Responsibilities: FreeSWITCH Core Responsibilities: - Install, configure, and maintain FreeSWITCH in production environments from the scratch. - Design and implement call flows, dialplans, IVRs, conferencing, and call routing with complete ownership. - Configure SIP profiles (internal/external), gateways, trunks, and extensions. - Implement multi-tenant and high-availability FreeSWITCH architectures. SIP, RTP & Networking: - Strong understanding of SIP signaling, RTP media, and SDP negotiation. - Troubleshoot one-way audio, no-audio, call drops, registration failures. - Configure NAT traversal, firewall rules, and RTP port ranges. - Analyze SIP logs and traces (siptrace, sngrep, tcpdump). Dialplan & Scripting: - Develop dialplans using XML and Lua / JavaScript / Python. - Implement logic for call queues, time-based routing, skill-based routing, and failover/fallback handling. Integrations & APIs: - Integrate FreeSWITCH with CRM/ERP systems, billing platforms, AI voice bots (ASR/TTS), and external WebSocket or REST services. - Use Event Socket Library (ESL) for inbound/outbound real-time call control and monitoring. WebRTC & Media: - Configure WebRTC support (DTLS-SRTP, ICE, OPUS), mod_verto, and SIP over WSS. - Implement browser-based calling solutions. Monitoring & Debugging: - Monitor system performance, call quality, logs, and CDRs. - Optimize codec usage and RTP performance. - Handle live production incidents and RCA. Deployment & Operations: - Deploy FreeSWITCH on Linux (CentOS / Ubuntu) and cloud platforms (AWS / GCP / Azure). - Configure HA, load balancing, and scaling. - Work with DevOps teams for CI/CD, backups, and automation. Ideal Candidate: - 4+ years of experience, with at least 3+ years of hands-on experience implementing, configuring, and supporting FreeSWITCH in production. - Strong hands-on knowledge of VoIP technologies (SIP, RTP, RTCP, SDP, WebRTC). - Proficiency in Linux administration, SQL (MySQL/PostgreSQL), and debugging tools (fs_cli, sngrep, tcpdump). - Immediate joiners or those available within 15 days are highly preferred.