FreeSWITCH Implementation Engineer - VoIP Protocol

Job Summary :

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 :

- 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 :

- 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 :

1. XML

2. Lua / JavaScript / Python

- Implement logic for :

1. Call queues for inbound and outbound calls

2. Time-based routing

3. Skill-based routing

4. Failover and fallback handling

Integrations & APIs :

1. CRM / ERP systems

2. Billing platforms

3. AI voice bots (ASR/TTS)

4. External WebSocket or REST services

- Use Event Socket Library (ESL):

1. Inbound & Outbound ESL

2. Real-time call control and monitoring

WebRTC & Media :

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

- Implement browser-based calling solutions

Monitoring & Debugging :

- Analyze logs and CDRs

- Optimize codec usage and RTP performance

- Handle live production incidents and RCA

Deployment & Operations :

1. Linux (CentOS / Ubuntu)

2. Cloud platforms (AWS / GCP / Azure preferred)

- Configure HA, load balancing, and scaling

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

Required Skills:

Technical Skills :

- Solid knowledge of VoIP protocols (SIP, RTP, RTCP, WebRTC)

- Linux system administration

- Dialplan development (XML/Lua/JS/Python)

- ESL & event-driven call control

- Debugging tools (fs_cli, sngrep, tcpdump)

- SQL / MySQL / PostgreSQL (CDR, reporting)