FreeSWITCH Implementation Engineer

Location: Gurugram
Job Type: Full Time - Onsite
Experience: 2-5 Years

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

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 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

* Solid understanding of SIP signaling, RTP media, and SDP negotiation.
* Troubleshoot one-way audio, no-audio, call drops, and registration failures.
* Configure NAT traversal,



firewall rules, and RTP port ranges.
* Analyze SIP logs and traces using siptrace, sngrep, and tcpdump.
Dialplan & Scripting

* 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
Integrations & APIs

* 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
WebRTC & Media

* Configure WebRTC support (DTLS-SRTP, ICE, OPUS).
* Work with mod_verto, SIP over WSS.
* Implement browser-based calling solutions.
Monitoring & Debugging

* Monitor system performance and call quality.
* Analyze logs and CDRs.
* Optimize codec usage and RTP performance.
* Handle live production in

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