Telephony Engineer (FreeSWITCH, VoIP)

Max NP : 30 days

Working Mode : In-Office

Working Days : 5 Days

Job Location : Gurugram

Ideal Candidate :

- 1. Strong FreeSWITCH Implementation Engineer profiles.

- 2. Must have minimum 4+ years experience, with at least 3+ years of hands-on experience implementing, configuring, and supporting FreeSWITCH in production environments.

- 3. Must have strong experience in designing and implementing FreeSWITCH call flows, including dialplans, IVRs, call routing, conferencing, SIP profiles, gateways, trunks, and extensions with end-to-end ownership.

- 4. Must have strong hands-on knowledge of VoIP technologies, including SIP, RTP, RTCP, SDP, WebRTC, and should be capable of troubleshooting call drops, one-way audio, registration failures, NAT traversal, and SIP/RTP-related issues.

- 5. Must have hands-on experience developing FreeSWITCH dialplans using XML and at least one scripting language such as Lua, JavaScript, or Python, including implementation of call queues, time-based routing, skill-based routing, and failover logic.

- 6. Must have experience integrating FreeSWITCH with CRM/ERP systems, REST APIs, WebSockets, AI Voice Bots (ASR/TTS), or Billing Platforms, along with hands-on experience using Event Socket Library (ESL) for real-time call control.

- 7. Must have strong Linux administration experience and should be comfortable deploying and managing FreeSWITCH on Ubuntu/CentOS, along with debugging using fs_cli, sngrep, tcpdump, and working with SQL (MySQL/PostgreSQL) for CDRs and reporting.

- 8. Immediate Joiners or candidates who can join within 15 days will be highly preferred.

- 9. Candidate must be currently based in Delhi NCR only.

- 10. Experience with AWS, Azure, or GCP, High Availability (HA), Load Balancing, CI/CD pipelines, automation, backups, and scalable FreeSWITCH deployments.

- 11. Experience implementing WebRTC-based calling solutions, including mod_verto, SIP over WSS, DTLS-SRTP, ICE, and OPUS codec configuration.

Interview Process:

HR Screening

Machine assessment

Virtual Interview with Tech Panel

About Role:

Key Skills:

FreeSWITCH, VoIP, Linux, SQL, Cloud, WebRTC

Roles & Responsibilities:

We are looking for a FreeSWITCH Implementation Engineer who will be responsible for designing, deploying, configuring, integrating, and maintaining FreeSWITCH-based VoIP platforms. The role involves working closely with SIP, RTP, WebRTC, IVR, conferencing, call routing, and external integrations in a production environment.

Key Responsibilities:

FreeSWITCH Core Responsibilities:

- Install, configure, and maintain FreeSWITCH in production environments from the scratch.

- Design and implement call flows, dialplans, IVRs, conferencing, and call routing with complete ownership.

- Configure SIP profiles (internal/external), gateways, trunks, and extensions.

- Implement multi-tenant and high-availability FreeSWITCH architectures.

SIP, RTP & Networking:

- Strong understanding of SIP signaling, RTP media, and SDP negotiation.

- Troubleshoot one-way audio, no-audio, call drops, registration failures.

- Configure NAT traversal, firewall rules, and RTP port ranges.

- Analyze SIP logs and traces (siptrace, sngrep, tcpdump).

Dialplan & Scripting:

- Develop dialplans using XML, Lua, JavaScript, or Python.

- Implement logic for call queues for inbound and outbound calls, time-based routing, skill-based routing, and failover and fallback handling.

Integrations & APIs:

- Integrate FreeSWITCH with CRM/ERP systems, billing platforms, AI voice bots (ASR/TTS), and external WebSocket or REST services.

- Use Event Socket Library (ESL) for inbound and outbound ESL, and real-time call control and monitoring.

WebRTC & Media:

- Configure WebRTC support (DTLS-SRTP, ICE, OPUS).

- Work with mod_verto and SIP over WSS.

- Implement browser-based calling solutions.

Monitoring & Debugging:

- Monitor system performance and call quality.

- Analyze logs and CDRs.

- Optimize codec usage and RTP performance.

- Handle live production incidents and RCA.

Deployment & Operations:

- Deploy FreeSWITCH on Linux (CentOS/Ubuntu) and cloud platforms (AWS/GCP/Azure).

- Configure HA, load balancing, and scaling.

- Work with DevOps teams for CI/CD, backups, and automation.