Job Title - Telephony Engineer

Budget  - Max Budget 25 LPA

Mode – WFO

nP – immediate to 30 days

exP – 3-10 yrs

Mandatory - 1-5 yrs in Freeswitch Development exp mandatory

Work Location - Gurgaon [Candidates to be based out of Delhi NCR Only]

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

🔹 Free SWITCH 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

🎓 Required Skills

✔ Technical Skills

• Strong experience with FreeSWITCH

• 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)

Job Title - Telephony Engineer

Budget  - Max Budget 25 LPA

Mode – WFO

nP – immediate to 30 days

exP – 3-10 yrs

Mandatory - 1-5 yrs in Freeswitch Development exp mandatory

Work Location - Gurgaon [Candidates to be based out of Delhi NCR Only]

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

🔹 Free SWITCH 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

🎓 Required Skills

✔ Technical Skills

• Strong experience with FreeSWITCH

• 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)