Associate VoIP Developer

Job Title:

Required Years of Experience:

Location:

FreeSWITCH-based VoIP platform

FreeSWITCH internals, Lua scripting, and API-driven workflows

Key Responsibilities:

• Design, implement, and manage complex call routing logic, agent transfers, and queue handling using FreeSWITCH.
• Develop and maintain Lua scripts to log call metadata (duration, type, start/end time) into databases.
• Configure IVR menus, agent stacks, and automated call flows.

• Integrate and manage Azure Text-to-Speech (TTS)

  for reading out mobile numbers and prompts in multiple languages.
• Handle real-time call recording, and integrate with REST APIs to upload recordings and update call logs.
• Optimize voice quality using

  Opus codec, Speex preprocessor, and WebRTC-based echo cancellation

  .
• Implement secure and scalable

  WebRTC

  communication for both web and mobile clients.
• Use tools like

  sngrep, tcpdump to debug SIP/RTP flows

  and troubleshoot call quality issues.

Skills Required:

• FreeSWITCH (Call routing, IVR, scripting)

• VoIP Protocols: SIP, RTP, RTCP, TLS, SRTP, WebRTC, TURN

• Codecs: PCMU, PCMA, G729, Opus

• Linux: System administration, debugging, scripting

• Scripting & API Integration

  :

  Lua, Python, REST APIs