Telephony Engineer (FreeSWITCH, VoIP )

Hiring for a Client - Eureka Digitisation & Automation Services (eDAS)

About the Role

We are looking for a FreeSWITCH Implementation Engineer to design, deploy, configure, integrate and maintain production-grade FreeSWITCH-based VoIP platforms. The role involves hands-on ownership across SIP, RTP, WebRTC, IVR, dialplans, call routing, integrations and production troubleshooting.

Key Responsibilities

• Install, configure and manage FreeSWITCH environments from scratch.
• Design and implement dialplans, IVRs, call flows, conferencing and call routing.
• Configure SIP profiles, gateways, trunks and extensions.
• Build multi-tenant and highly available FreeSWITCH architectures.
• Troubleshoot SIP/RTP issues, call drops, one-way/no audio, registration failures and NAT traversal.
• Develop dialplans using XML and scripting languages such as Lua, JavaScript or Python.
• Implement queue, time-based, skill-based, failover and fallback routing.
• Integrate FreeSWITCH with CRM/ERP, billing platforms, REST APIs, WebSockets and AI Voice Bots (ASR/TTS).
• Work with ESL (Event Socket Library) for real-time call control and monitoring.
• Configure and support WebRTC, DTLS-SRTP, ICE, OPUS, mod_verto and SIP over WSS.
• Monitor call quality, system performance, logs and CDRs, and handle production incidents and RCA.
• Deploy and manage FreeSWITCH on Linux (Ubuntu/CentOS) and cloud environments.
• Work with DevOps teams on HA, load balancing, CI/CD, backups and automation.

Mandatory Requirements

• 4+ years of overall experience, including 3+ years of hands-on FreeSWITCH implementation and production support.
• Strong expertise in FreeSWITCH call flows, dialplans, IVRs, routing, conferencing, SIP profiles, gateways, trunks and extensions.
• Strong knowledge of SIP, RTP, RTCP, SDP and WebRTC with proven troubleshooting skills.
• Hands-on experience with FreeSWITCH XML dialplans and at least one of Lua, JavaScript or Python.
• Experience implementing call queues, skill/time-based routing and failover logic.
• Experience integrating FreeSWITCH with CRM/ERP, REST APIs, WebSockets, AI Voice Bots or billing platforms.
• Hands-on experience with ESL for real-time call control.
• Strong Linux administration skills and experience with Ubuntu/CentOS.
• Proficiency with fs_cli, sngrep and tcpdump for debugging and troubleshooting.
• Experience working with MySQL/PostgreSQL for CDRs and reporting.
• Delhi NCR-based candidates only.
• Immediate joiners or candidates who can join within 15 days are highly preferred.

Good to Have

• Experience with AWS, Azure or GCP.
• Hands-on experience with High Availability, Load Balancing, CI/CD, automation and scalable FreeSWITCH deployments.
• Experience building WebRTC-based calling solutions using mod_verto, SIP over WSS, DTLS-SRTP, ICE and OPUS.