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Freeswitch Developer
Freeswitch Developer
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Freeswitch Developer

Monjura Parveen's profile picture
Posted by Monjura Parveen
4 - 8 yrs
₹5L - ₹12L / yr
Kolkata
Skills
FreeSWITCH
VoIP Protols
Audioconferencing
Videoconferencing
RTP proxy
Linux/Unix
Scripting
Audio codecs
WebRTC

Job Opening: FreeSWITCH Developer

Location: Ecospace Business Park, Rajarhat, Newtown, Kolkata

Employment Type: Full-Time, Permanent

Shift: Day Shift

Experience: Minimum 4+ years in FreeSWITCH/VoIP Development

Responsibilities:

  • Design, develop, deploy, troubleshoot, and maintain tools and services supporting our cloud telephony network.
  • Customize FreeSWITCH for large-scale audio/video conferencing (1000–1500 concurrent calls).
  • Expertise in SIP, RTP, RTCP, TURN, STUN, NAT, TLS.
  • Hands-on experience with RTP Proxy and routed audio conferences.
  • Understanding of SDP Protocol offer/answer mechanism.
  • Work with load testing tools for FreeSWITCH audio conferences.
  • Deploy and manage multiple FreeSWITCH instances using load balancers.
  • Debug issues using packet captures (Wireshark/Ngrep).
  • Collaborate with mobile/API teams for integration and support.
  • Knowledge of codecs (PCMU, PCMA, G729, Opus) and open-source telephony technologies (FreeSWITCH, WebRTC).
  • Familiarity with SIP servers (SER/OpenSER), proxy servers, SBC, SIPX is a plus.

Qualifications:

  • Bachelor’s degree in Engineering (B.Tech/MCA).
  • 4+ years of hands-on experience in FreeSWITCH development or related VoIP technologies.
  • Strong knowledge of Linux environments and command-line tools.
  • Basic to intermediate SQL knowledge.
  • Proficiency in scripting (Bash, Python, Perl) for automation.
  • Strong understanding of VoIP protocols (SIP, RTP), networking principles (TCP/IP, DNS, DHCP, routing protocols).
  • Excellent troubleshooting skills with ability to resolve complex technical issues.
  • Strong problem-solving, communication, and collaboration skills.

Industry Preference:

  • Travel (Preferred)
  • Any Industry (Required)
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