Hiring for a Client - eDAS

This position centers on deploying, establishing, customizing, connecting, and supporting FreeSWITCH-based VoIP platforms. You will partner with teams managing SIP, RTP, WebRTC, IVR, conferencing, call routing, and third-party integrations in live operational settings.
FreeSWITCH Core Responsibilities
Set up, establish configuration of, and operate FreeSWITCH within production settings from initial implementation
Build and execute call flows, dialplans, IVRs, conferencing, and call routing with full accountability
Set up SIP profiles (internal/external), gateways, trunks, and extensions
Build multi-tenant and high-availability FreeSWITCH setups
SIP, RTP & Networking
Demonstrate deep comprehension of SIP signaling, RTP media, and SDP negotiation
Resolve one-way audio, audio loss, dropped calls, and registration problems
Establish NAT traversal, firewall settings, and RTP port configurations
Review SIP logs and packet captures (siptrace, sngrep, tcpdump)
Dialplan & Scripting
Develop dialplans with XML and Lua / JavaScript / Python
Create implementations for call queues for inbound and outbound calls, time-based routing, skill-based routing, and failover and fallback handling
Integrations & APIs
Connect FreeSWITCH to CRM / ERP systems, billing platforms, AI voice bots (ASR/TTS), and external WebSocket or REST services
Leverage Event Socket Library (ESL) for inbound & outbound ESL, real-time call control and monitoring
WebRTC & Media
Set up WebRTC support (DTLS-SRTP, ICE, OPUS)
Engage with mod_verto, SIP over WSS
Roll out browser-based calling systems
Monitoring & Debugging
Track system performance and call quality
Examine logs and CDRs
Enhance codec usage and RTP performance
Address live production incidents and RCA
Deployment & Operations
Establish FreeSWITCH on Linux (CentOS / Ubuntu) and cloud platforms (AWS / GCP / Azure – preferred)
Organize HA, load balancing, and scaling
Partner with DevOps teams for CI/CD, backups, and automation





Requirements
Expert-level FreeSWITCH Implementation Engineer background
Mandatory (Experience 1) – Minimum 4 years of skilled experience, including at least 3 years of direct hands-on expertise implementing, configuring, and supporting FreeSWITCH in production environments
Mandatory (Experience 2) – Proven capability in architecting and executing FreeSWITCH call flows, dialplans, IVRs, call routing, conferencing, SIP profiles, gateways, trunks, and extensions with end-to-end ownership
Mandatory (Experience 3) – Extensive practical expertise with VoIP technologies, including SIP, RTP, RTCP, SDP, WebRTC, along with problem-solving skills for call drops, one-way audio, registration failures, NAT traversal, and SIP/RTP-related issues
Mandatory (Experience 4) – Hands-on involvement in building FreeSWITCH dialplans via XML and proficiency in at least one scripting language such as Lua, JavaScript, or Python, with implementations of call queues, time-based routing, skill-based routing, and failover logic
Mandatory (Experience 5) – Experience connecting FreeSWITCH with CRM/ERP systems, REST APIs, WebSockets, AI Voice Bots (ASR/TTS), or Billing Platforms, with direct experience using Event Socket Library (ESL) for real-time call control
Mandatory (Experience 6) – Deep Linux administration capabilities and readiness to provision and oversee FreeSWITCH on Ubuntu/CentOS, combined with troubleshooting via fs_cli, sngrep, tcpdump, and SQL (MySQL/PostgreSQL) experience for CDRs and reporting
Mandatory (Notice Period) – Those available to begin immediately or who can commence within 15 days are especially sought
Preferred (Experience 1) – Background with AWS, Azure, or GCP, High Availability (HA), Load Balancing, CI/CD pipelines, automation, backups, and scalable FreeSWITCH deployments
Preferred (Experience 2) – Experience building WebRTC-based calling applications, covering mod_verto, SIP over WSS, DTLS-SRTP, ICE, and OPUS codec configuration
Experience: 4–10 years · Work from office · 5 days a week · Notice period up to 30 days

📌 Telephony Engineer (FreeSWITCH, VoIP ) (Gurugram)
🏢 TalentXO
📍 Gurugram