About the Role

We are looking for a highly skilled Sr. VOIP Developer with strong hands-on experience in Asterisk, FreeSWITCH, SIP-based telephony systems, and open-source dialer ecosystems. The ideal candidate will be responsible for the configuration, customization, deployment, troubleshooting, and optimization of VoIP infrastructure and communication platforms.

This role requires deep technical expertise in PBX systems, dialplan/XML programming, IVR design, call center solutions, and SIP server technologies such as Kamailio and OpenSIPS.

Key Responsibilities

- Configure, deploy, maintain, and troubleshoot Asterisk / FreeSWITCH based VoIP systems
- Perform Asterisk / FreePBX data migration, upgrades, and system optimization
- Develop and manage Dialplans, XML-based call flows, and telephony logic
- Design and implement IVR / IVRS solutions, auto-reminder systems, and voice broadcasting setups
- Build and support call center environments, conference bridges, inbound/outbound calling systems, and routing logic
- Work on AGI scripting and telephony automation to improve system efficiency
- Configure and manage SIP trunking, call routing, failover, and voice quality optimization
- Deploy, maintain, and troubleshoot open-source dialer platforms such as VicidialNow and OSDial




- Support and optimize Kamailio / OpenSIPS based SIP routing and proxy environments
- Work with WebRTC, voice logger systems, and real-time communication solutions
- Monitor VoIP infrastructure performance and proactively resolve service issues
- Collaborate with development and operations teams for integrations, deployments, and enhancements
- Manage Linux-based servers and support backend telephony applications
- Maintain system security, uptime, backups, and documentation

Required Skills & Technical Expertise

Core VoIP / Telephony

Robust hands-on experience with:

Asterisk | FreeSWITCH | SIP / VoIP | Dialplan Programming | XML Programming | AGI Scripting | IVRS / IVR Design | Call Center Setup |

Conference Systems | Voice Broadcasting | Auto Reminder Systems | Voice Logger | SIP Proxy / Routing

Working knowledge of

Kamailio | OpenSIPS | Dialer / Open Source Support

Experience with

VicidialNow | OSDial | ASTPP Billing Software | Development / Scripting |

Familiarity with

Lua | Perl | PHP | Node.js | Erlang | CURL | memcache | Infrastructure / Systems

Strong understanding of

Linux System Administration | LAMP Stack | WebRTC | RabbitMQ | Database Administration

Database experience preferred

Oracle / OCP Certified is an added advantage

📌 Sr. VOIP Developer - Remote (US Shift) (India)
🏢 Adit
📍 India