FreeSWITCH & OpenSIPS Developer VOIP

2 weeks ago

Delhi Greater Noida NCR Noida, India Infra Payments Full time ₹ 9,00,000 - ₹ 12,00,000 per year

Key Responsibilities:

  • Design, configure, and maintain OpenSIPS as SIP proxy/registrar/load balancer.
  • Develop and customize FreeSWITCH for call routing, IVR, conferencing, and advanced VoIP features.
  • Implement SIP, RTP, WebRTC integrations with high availability and redundancy.
  • Optimize system performance for low latency and high concurrent call handling.
  • Troubleshoot signaling and media issues using SIP traces, Wireshark, sngrep, Homer, etc.
  • Collaborate with network/security teams for NAT traversal, TLS/SRTP, and firewall policies.
  • Work with developers for API integrations (REST, XML, ESL) and billing systems.
  • Ensure system scalability, failover testing, and load balancing.

Required Skills & Qualifications:

  • Strong hands-on experience with OpenSIPS (or Kamailio) scripting, module configuration, clustering.
  • Proven expertise in FreeSWITCH – dialplans, Lua/JavaScript modules, ESL, and media applications.
  • Good understanding of SIP, RTP, STUN/TURN/ICE, ENUM, DNS-SRV.
  • Proficiency in Linux (Debian/Ubuntu/CentOS) server administration.
  • Experience with PostgreSQL/MySQL, Redis, RabbitMQ/Kafka is a plus.
  • Familiarity with Ansible/Docker/Kubernetes for deployment is an added advantage.
  • Excellent debugging and problem-solving skills.

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