Implementation Engineer

Job Description

# 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

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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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• Strong 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 solutions.
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### Monitoring & Debugging

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• Monitor system performance and call quality.
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• Analyze logs and CDRs.
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• Optimize codec usage and RTP performance.
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• Handle live production incidents and RCA.
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### Deployment & Operations

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• Deploy FreeSWITCH on:
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• Linux (CentOS / Ubuntu)
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• Cloud platforms (AWS / GCP / Azure – preferred)
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• Configure **HA, load balancing, and scaling**.
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• Work with DevOps teams for CI/CD, backups, and automation.
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## Required Skills

### Technical Skills

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• Strong experience with **FreeSWITCH**.
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• Solid knowledge of **VoIP protocols (SIP, RTP, RTCP, WebRTC)**.
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• Linux system administration.
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• Dialplan development (**XML/Lua/JS/Python**).
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• ESL & event-driven call control.
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• Debugging tools (**fs_cli, sngrep, tcpdump**).
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• SQL / MySQL / PostgreSQL (CDR, reporting).
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