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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.

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:
- 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.

Requirements :

- Must have minimum 4 years experience, with at least 3 years of hands-on experience implementing, configuring, and supporting FreeSWITCH in production environments.
- Must have strong experience in designing and implementing FreeSWITCH call flows, including dialplans, IVRs, call routing, conferencing, SIP profiles, gateways, trunks, and extensions with end-to-end ownership.
- Must have solid hands-on knowledge of VoIP technologies, including SIP, RTP, RTCP, SDP, WebRTC, and should be capable of troubleshooting call drops, one-way audio, registration failures, NAT traversal, and SIP/RTP-related issues.
- Must have hands-on experience developing FreeSWITCH dialplans using XML and at least one scripting language such as Lua, JavaScript, or Python, including implementation of call queues, time-based routing, skill-based routing, and failover logic.
- Must have experience integrating FreeSWITCH with CRM/ERP systems, REST APIs, WebSockets, AI Voice Bots (ASR/TTS), or Billing Platforms, along with hands-on experience using Event Socket Library (ESL) for real-time call control.
- Must have strong Linux administration experience and should be comfortable deploying and managing FreeSWITCH on Ubuntu/CentOS, along with debugging using fs_cli, sngrep, tcpdump, and working with SQL (MySQL/PostgreSQL) for CDRs and reporting.
- Immediate Joiners or candidates who can join within 15 days will be highly preferred.
- Mandatory (Location) Candidate must be currently based in Delhi NCR only.

📌 Telephony Engineer - VoIP/FreeSWITCH (India)
🏢 HR Works Consultancy
📍 India