FreeSWITCH Implementation Engineer - Network Protocols

Position : FreeSWITCH Implementation EngineerOverall/Total Experience : 4-7 years onlyLocation : Gurugram (Only for Delhi/NCR Candidates)Working Days : 5 Days Working from officeNotice Period Requirement : 30 Days (Maximum)Client's Company Size : Mid-SizedRoles & 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.- Strong understanding of SIP signaling, RTP media, and SDP negotiation.- Configure NAT traversal, firewall rules, and RTP port ranges.- Analyze SIP logs and traces (siptrace, sngrep, tcpdump).- Develop dialplans using: XML, Lua / JavaScript / Python.- Implement logic for: Call queues for inbound and outbound calls, Time-based routing, Skill-based routing, Failover and fallback handling.- Integrate FreeSWITCH with: CRM / ERP systems, Billing platforms, AI voice bots (ASR/TTS), External WebSocket or REST services.- Use Event Socket Library (ESL): Inbound & Outbound ESL, Real-time call control and monitoring.- Configure WebRTC support (DTLS-SRTP, ICE, OPUS).- Analyze logs and CDRs.- Optimize codec usage and RTP performance.Candidate Requirements :- Must have 4+ years' experience, with at least 3+ years of hands-on experience implementing, configuring, and supporting FreeSWITCH in production environments.- Must have experience in designing and implementing FreeSWITCH call flows, including dialplans, IVRs, call routing, conferencing, SIP profiles, gateways, trunks, and extensions.- Must have hands-on knowledge of VoIP technologies, including SIP, RTP, RTCP, SDP, WebRTC, and should be capable of troubleshooting call drops, one-way audio, registration failures, NAT traversal, and SIP/RTP-related issues.- Must have experience developing FreeSWITCH dialplans using XML and at least one scripting language such as Lua, JavaScript, or Python, including implementation of call queues, time-based routing, skill-based routing, and failover logic.- Must have experience integrating FreeSWITCH with CRM/ERP systems, REST APIs, WebSockets, AI Voice Bots (ASR/TTS), or Billing Platforms, along with hands-on experience using Event Socket Library (ESL).- Must have strong Linux administration experience and deploying/managing FreeSWITCH on Ubuntu/CentOS, along with debugging using fs_cli, sngrep, tcpdump, and working with SQL (MySQL/PostgreSQL). (ref:hirist.tech)