FreeSWITCH Developer

3 - 8 years

0 - 3 Lacs

Posted:1 week ago| Platform: Naukri logo

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Job Type

Full Time

Job Description

Are you passionate about cloud telephony, VoIP systems, and building next-gen PBX solutions? Were looking for a skilled FreeSWITCH Developer to help us develop a robust and scalable PBX panel for enterprise-level deployments.

Key Responsibilities:

  • • Design, develop, and maintain tools supporting a scalable cloud telephony infrastructure.
  • • Customize FreeSWITCH for audio/video conferencing, capable of 1000 to 1500 concurrent calls.
  • • Deep understanding of SIP, RTP, RTCP, NAT traversal (TURN/STUN), and TLS encryption.
  • • Build and deploy multiple FreeSWITCH instances behind load balancers for high availability.
  • • Analyze media stream issues using tools like Wireshark and debug SIP signaling errors.
  • • Work closely with frontend/mobile teams to develop API-driven PBX solutions.
  • • Integrate codecs like PCMU, PCMA, G729, Opus and support SDP offer/answer model.
  • • Collaborate on RTP Proxy, routed audio conferencing, and NAT traversal setups.
  • • Familiarity with SIP proxy servers (e.g. Kamailio/OpenSER) and Session Border Controllers (SBCs).
  • • Bonus: Knowledge of H.323, SIPX, WebRTC, and SMPP.

You Should Have:

  • • Strong hands-on experience with FreeSWITCH or other open-source telephony platforms.
  • • Deep understanding of telecom signaling protocols and VoIP architecture.
  • • Practical experience developing or supporting PBX platforms.
  • • Experience with SIP debugging and high-concurrency media handling.

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