Role & responsibilities

: FreeSWITCH Developer C/C++ / VoIP Engineer

Experience: 5+ Years

Work Locations: Bangalore, Hyderabad, Kochi, Bhubaneswar, Delhi NCR, Pune

Education: B.E./B.Tech in Computer Science, Electronics, Telecommunications, or equivalent qualification.

Role Overview

We are looking for an experienced FreeSWITCH Developer with strong expertise in C/C++, SIP, VoIP, and WebRTC technologies. The candidate will be responsible for developing, integrating, configuring, and maintaining FreeSWITCH-based telephony solutions and integrating them with Contact Center as a Service (CCaaS) platforms.

Key Responsibilities

- Develop, customize, and maintain FreeSWITCH modules and dialplans using C/C++.
- Implement FreeSWITCH Event Socket Library (ESL) and API integrations.
- Configure and troubleshoot SIP signaling, SIP trunks, RTP, SRTP, NAT traversal, and codec settings.
- Work with WebRTC technologies, including ICE, STUN/TURN, DTLS-SRTP, SDP, mod_verto, and WebSocket Secure (WSS).
- Integrate FreeSWITCH with contact center platforms and custom CCaaS solutions.
- Configure Automatic Call Distribution (ACD), skill-based routing, and queue management using mod_callcenter or FIFO queues.
- Implement call recording, call monitoring, supervisor whisper/barge, and related contact center features.
- Monitor system health, analyze logs, troubleshoot production issues, and respond to incidents.
- Manage gateway deployments, configuration changes,



codec optimization, and call-quality improvements.
- Prepare technical documentation, operational runbooks, and standard operating procedures (SOPs).
- Collaborate with cross-functional teams to ensure system reliability, scalability, and performance.

Mandatory Skills
- Hands-on experience with FreeSWITCH development and configuration.
- Strong programming skills in C and C++.
- Good understanding of SIP protocols and SIP trunk configuration.
- Experience with FreeSWITCH dialplans, modules, and ESL/API integrations.
- Knowledge of RTP, SRTP, NAT, codec configuration, and media optimization.
- Hands-on understanding of WebRTC, ICE, STUN/TURN, DTLS-SRTP, SDP, and WSS.
- Experience in troubleshooting VoIP and real-time communication systems.

Good-to-Have Skills
- Experience with Asterisk or similar telephony platforms.
- Experience integrating FreeSWITCH with CCaaS or contact center solutions.
- Knowledge of ACD, skill-based routing, FIFO queues, and supervisor features.
- Experience with production monitoring, incident management, and log analysis.

Qualifications
- B.E./B.Tech in Computer Science, Electronics, Telecommunications, or an equivalent discipline.
- Minimum 5 years of relevant experience in FreeSWITCH, VoIP, SIP, or telecom software development.
- Solid analytical, debugging, problem-solving, and communication skills

📌 FreeSWITCH Developer /VoIP Engineer (Bengaluru)
🏢 Cerebra
📍 Bengaluru