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Telephony Engineer (FreeSWITCH, VoIP ) | Job #TX-7260 | In Office ~ Gurugram

MCS Chennai
Gurugram, Haryana

Quick apply

Job details

Permanent | Full-time
₹15,00,000 - ₹25,00,000 a year
1 day ago

Qualifications

CI/CD
Azure
XML
Load balancing
Microsoft Office
SQL
AWS
IVR
VoIP
JavaScript
PostgreSQL
Continuous integration
REST
Ubuntu
User acceptance testing
APIs
ServiceNow
CentOS
Linux
Unit testing
Solution architecture
AI
Billing
Python
Lua
MySQL
High availability

Full job description

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:

o XML

o Lua / JavaScript / Python

 Implement logic for:

o Call queues for inbound and outbound calls

o Time-based routing

o Skill-based routing

o Failover and fallback handling

�� Integrations & APIs

 Integrate FreeSWITCH with:

o CRM / ERP systems

o Billing platforms

o AI voice bots (ASR/TTS)

o External WebSocket or REST services

 Use Event Socket Library (ESL):

o Inbound & Outbound ESL

o 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:

o Linux (CentOS / Ubuntu)

o Cloud platforms (AWS / GCP / Azure – preferred)

 Configure HA, load balancing, and scaling

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

Ideal Candidate1Strong FreeSWITCH Implementation Engineer Profiles2Mandatory (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.3Mandatory (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.4Mandatory (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.5Mandatory (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.6Mandatory (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.7Mandatory (Experience 6) – Must have strong 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.8Mandatory (Notice Period) – Immediate Joiners or candidates who can join within 15 days will be highly preferred.9Mandatory (Location) - Mandatory (Location) – Candidate must be currently based in Delhi NCR only10Preferred (Experience 1) – Experience with AWS, Azure, or GCP, High Availability (HA), Load Balancing, CI/CD pipelines, automation, backups, and scalable FreeSWITCH deployments.11Preferred (Experience 2) – Experience implementing WebRTC-based calling solutions, including mod_verto, SIP over WSS, DTLS-SRTP, ICE, and OPUS codec configuration.

UiPath RPA Associate certification
Exposure to REFramework

Pay: ₹1,500,000.00 - ₹2,500,000.00 per year

Work Location: In person

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billing engineer jobs in janakpuri delhi delhi

Telephony Engineer (FreeSWITCH, VoIP ) | Job #TX-7260 | In Office ~ Gurugram

Engineer

Senior Field service engineer /Delhi/NCR

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Tech Lead - BRM PDC developer

Assistant Manager - Planning

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