# 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

* Strong 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 incidents and RCA.

### Deployment & Operations

* Deploy FreeSWITCH on:

* Linux (CentOS / Ubuntu)

* Cloud platforms (AWS / GCP / Azure – preferred)

* Configure HA, load balancing, and scaling.

* Work with DevOps teams for CI/CD, backups, and automation.

## Required Skills

### Technical Skills

* Solid experience with FreeSWITCH.

* Solid knowledge of VoIP protocols (SIP, RTP, RTCP, WebRTC).

* Linux system administration.

* Dialplan development (XML/Lua/JS/Python).

* ESL & event-driven call control.

* Debugging tools (fs_cli, sngrep, tcpdump).

* SQL / MySQL / PostgreSQL (CDR, reporting).

📌 Implementation Engineer (Delhi)
🏢 Sourcebae
📍 Delhi