Implementation engineer

# Free SWITCH Implementation Engineer

Location: Gurugram

Job Type: Full Time - Onsite

Experience: 2-5 Years

**CTC:** 12 LPA for 2 years / 20 LPA for 5 years

## Job Summary

We are looking for a **Free SWITCH Implementation Engineer** who will be responsible for **designing, deploying, configuring, integrating, and maintaining Free SWITCH-based Vo IP platforms**. The role involves working closely with **SIP, RTP, Web RTC, IVR, conferencing, call routing, and external integrations** in a production environment.

## Key Responsibilities

### Free SWITCH Core Responsibilities

Install, configure, and maintain **Free SWITCH** in production environments from 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 Free SWITCH architectures**.

### SIP, RTP & Networking

Strong understanding of **SIP signaling, RTP media, and SDP negotiation**. Troubleshoot **one-way audio, no-audio, call drops, and registration failures**. Configure **NAT traversal, firewall rules, and RTP port ranges**. Analyze SIP logs and traces using **siptrace, sngrep, and tcpdump**.

### Dialplan & Scripting

Develop dialplans using: XML Lua / Java Script / Python Implement logic for: Call queues for inbound and outbound calls Time-based routing Skill-based routing Failover and fallback handling

### Integrations & APIs

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

### Web RTC & Media

Configure **Web RTC 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 Free SWITCH on: Linux (Cent OS / Ubuntu) Cloud platforms (AWS / GCP / Azure – preferred) Configure **HA, load balancing, and scaling**. Work with Dev Ops teams for CI/CD, backups, and automation.

## Required Skills

### Technical Skills

Strong experience with **Free SWITCH**. Solid knowledge of **Vo IP protocols (SIP, RTP, RTCP, Web RTC)**. Linux system administration. Dialplan development (**XML/Lua/JS/Python**). ESL & event-driven call control. Debugging tools (**fs_cli, sngrep, tcpdump**). SQL / My SQL / Postgre SQL (CDR, reporting).