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 routingwith 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 / Python
- Implement logic for:
- Call queues for inbound and outbound calls
- Time-based routing
- Skill-based routing
- Failover and fallback handling

Integrations & APIs

- Integrate FreeSWITCH with:
- CRM / ERP systems
- Billing platforms
- AI voice bots (ASR/TTS)
- External WebSocket or REST services
- Use Event Socket Library (ESL):
- Inbound & Outbound ESL
- Real-time call control and monitoring

WebRTC & Media

- Configure WebRTC support (DTLS-SRTP, ICE, OPUS)
- Work with mod_verto, 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)
- Cloud platforms (AWS / GCP / Azure – preferred)
- Configure HA, load balancing, and scaling
- Work with DevOps teams for CI/CD, backups, and automation

Ideal Candidate

- Strong FreeSWITCH Implementation Engineer Profiles
- Mandatory (Experience 1) – Must have minimum 4+ years experience, with at least 3+ years of hands-on experience implementing, configuring, and supporting FreeSWITCH in production environments.
- Mandatory (Experience 2) – 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.
- Mandatory (Experience 3) – 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.
- Mandatory (Experience 4)



– 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.
- Mandatory (Experience 5) – 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.
- Mandatory (Experience 6) – Must have solid 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.
- Mandatory (Notice Period) – Immediate Joiners or candidates who can join within 15 days will be highly preferred.
- Mandatory (Location) - Mandatory (Location) – Candidate must be currently based in Delhi NCR only
- Preferred (Experience 1) – Experience with AWS, Azure, or GCP, High Availability (HA), Load Balancing, CI/CD pipelines, automation, backups, and scalable FreeSWITCH deployments.
- Preferred (Experience 2) – Experience implementing WebRTC-based calling solutions, including mod_verto, SIP over WSS, DTLS-SRTP, ICE, and OPUS codec configuration.

Pay: From ₹80,000.00 per month

Benefits

- Paid sick time
- Paid time off

Application Question(s):
- Your Current CTC and Your Notice Period

Experience:
- Total: 4 years (Required)

Work Location: In person

📌 Telephony Engineer (FreeSWITCH, VoIP) (Gurugram)
🏢 Qualitrix Technologies
📍 Gurugram