Telephony Engineer (FreeSWITCH, VoIP )

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 / 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

Skills: platforms,sip,call routing,voip,aws,amp,webrtc,routing,freeswitch