Roles & Responsibilities

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 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
- 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, registration failures
- Configure NAT traversal, firewall rules, and RTP port ranges
- Analyze SIP logs and traces (siptrace, sngrep, tcpdump)

Dialplan & Scripting

- Develop dialplans using:

o XML

o Lua / JavaScript / Python

- Implement logic for:

o Call queues for inbound and outbound calls

o Time-based routing

o Skill-based routing

o Failover and fallback handling





Integrations & APIs

- Integrate FreeSWITCH with:

o CRM / ERP systems

o Billing platforms

o AI voice bots (ASR/TTS)

o External WebSocket or REST services

- Use Event Socket Library (ESL):

o Inbound & Outbound ESL

o 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:

o Linux (CentOS / Ubuntu)

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

- Configure HA, load balancing, and scaling
- Work with DevOps teams for CI/CD, backups, and automation

Ideal Candidate

Required Skills

✔ Technical Skills

- Robust 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)

📌 Telephony Engineer (FreeSWITCH, VoIP ) (Gurugram)
🏢 eDAS - Eureka Digitisation and Automation Services
📍 Gurugram