Job Description
FreeSWITCH Implementation Engineer

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Location: Gurugram

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Job Type: Full Time - Onsite

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Experience: 2-5 Years

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CTC: 12 LPA for 2 years / 20 LPA for 5 years

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Job Summary

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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.

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Key Responsibilities

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FreeSWITCH Core Responsibilities

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- Install, configure, and maintain FreeSWITCH in production environments from scratch.
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- Design and implement call flows, dialplans, IVRs, conferencing, and call routing with complete ownership.
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- Configure SIP profiles (internal/external), gateways, trunks, and extensions.
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- Implement multi-tenant and high-availability FreeSWITCH architectures.
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SIP, RTP & Networking

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- Solid understanding of SIP signaling, RTP media, and SDP negotiation.
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- Troubleshoot one-way audio, no-audio,



call drops, and registration failures.
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- Configure NAT traversal, firewall rules, and RTP port ranges.
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- Analyze SIP logs and traces using siptrace, sngrep, and tcpdump.
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Dialplan & Scripting

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- Develop dialplans using:
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- XML
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- Lua / JavaScript / Python
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- Implement logic for:
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- Call queues for inbound and outbound calls
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- Time-based routing
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- Skill-based routing
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- Failover and fallback handling
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Integrations & APIs

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- Integrate FreeSWITCH with:
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- CRM / ERP systems
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- Billing platforms
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- AI voice bots (ASR/TTS)
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- External WebSocket or REST services
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- Use Event Socket Library (ESL):
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- Inbound & Outbound ESL
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- Real-time call control and monitoring
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WebRTC & Media

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- Configure WebRTC support (DTLS-SRTP, ICE, OPUS).
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- Work with mod_verto, SIP over WSS.
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- Implement browser-based calling sol

📌 Implementation Engineer (Delhi)
🏢 Sourcebae
📍 Delhi