{"id":1252153,"url":"https://alion.io/job/mnm-hiretech-pvt-ltd-telephony-engineer","title":"Telephony Engineer","company":{"id":3806495,"name":"MNM Hiretech","domain":"mnmhiretech.com","url":"https://alion.io/company/mnm-hiretech-pvt-ltd","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"middle","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Gurgaon, India"],"countries":["IN"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":1500000,"max":2100000,"currency":"INR","period":"year","gross":true,"usd_annual":22012},"salary_estimate":null,"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"CentOS Stream","optional":false},{"name":"CI/CD","optional":false},{"name":"GCP","optional":false},{"name":"JavaScript","optional":false},{"name":"Linux","optional":false},{"name":"Lua","optional":false},{"name":"MySQL","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"Rest API","optional":false},{"name":"Speech Recognition","optional":false},{"name":"SQL","optional":false},{"name":"Tcpdump","optional":false},{"name":"Text-to-Speech","optional":false},{"name":"Ubuntu","optional":false},{"name":"WebRTC","optional":false},{"name":"WebSockets","optional":false}],"status":"live","first_seen_at":"2026-09-15T13:21:52Z","employer_posted_date":null,"last_verified_at":"2026-09-15T13:21:52Z","board_verified":false,"closed_at":null,"days_open":39,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":39},"description":"Telephony Engineer (FreeSWITCH, VoIP)\n\nMax NP : 30 days\n\nWorking Mode : In-Office\n\nWorking Days : 5 Days\n\nJob Location : Gurugram\n\nIdeal Candidate :\n\n- 1. Strong FreeSWITCH Implementation Engineer profiles.\n\n- 2. Must have minimum 4+ years experience, with at least 3+ years of hands-on experience implementing, configuring, and supporting FreeSWITCH in production environments.\n\n- 3. 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.\n\n- 4. 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.\n\n- 5. 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.\n\n- 6. 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.\n\n- 7. 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.\n\n- 8. Immediate Joiners or candidates who can join within 15 days will be highly preferred.\n\n- 9. Candidate must be currently based in Delhi NCR only.\n\n- 10. Experience with AWS, Azure, or GCP, High Availability (HA), Load Balancing, CI/CD pipelines, automation, backups, and scalable FreeSWITCH deployments.\n\n- 11. Experience implementing WebRTC-based calling solutions, including mod_verto, SIP over WSS, DTLS-SRTP, ICE, and OPUS codec configuration.\n\nInterview Process:\n\nHR Screening\n\nMachine assessment\n\nVirtual Interview with Tech Panel\n\nAbout Role:\n\nKey Skills:\n\nFreeSWITCH, VoIP, Linux, SQL, Cloud, WebRTC\n\nRoles & Responsibilities:\n\nWe 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.\n\nKey Responsibilities:\n\nFreeSWITCH Core Responsibilities:\n\n- Install, configure, and maintain FreeSWITCH in production environments from the scratch.\n\n- Design and implement call flows, dialplans, IVRs, conferencing, and call routing with complete ownership.\n\n- Configure SIP profiles (internal/external), gateways, trunks, and extensions.\n\n- Implement multi-tenant and high-availability FreeSWITCH architectures.\n\nSIP, RTP & Networking:\n\n- Strong understanding of SIP signaling, RTP media, and SDP negotiation.\n\n- Troubleshoot one-way audio, no-audio, call drops, registration failures.\n\n- Configure NAT traversal, firewall rules, and RTP port ranges.\n\n- Analyze SIP logs and traces (siptrace, sngrep, tcpdump).\n\nDialplan & Scripting:\n\n- Develop dialplans using XML, Lua, JavaScript, or Python.\n\n- Implement logic for call queues for inbound and outbound calls, time-based routing, skill-based routing, and failover and fallback handling.\n\nIntegrations & APIs:\n\n- Integrate FreeSWITCH with CRM/ERP systems, billing platforms, AI voice bots (ASR/TTS), and external WebSocket or REST services.\n\n- Use Event Socket Library (ESL) for inbound and outbound ESL, and real-time call control and monitoring.\n\nWebRTC & Media:\n\n- Configure WebRTC support (DTLS-SRTP, ICE, OPUS).\n\n- Work with mod_verto and SIP over WSS.\n\n- Implement browser-based calling solutions.\n\nMonitoring & Debugging:\n\n- Monitor system performance and call quality.\n\n- Analyze logs and CDRs.\n\n- Optimize codec usage and RTP performance.\n\n- Handle live production incidents and RCA.\n\nDeployment & Operations:\n\n- Deploy FreeSWITCH on Linux (CentOS/Ubuntu) and cloud platforms (AWS/GCP/Azure).\n\n- Configure HA, load balancing, and scaling.\n\n- Work with DevOps teams for CI/CD, backups, and automation.\nSkills\nFreeSWITCH, VoIP, 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