VoIP Engineer - SIP/SBC

Description :

Key Responsibilities :

- Design, deploy, configure, and maintain scalable VoIP infrastructure.

- Manage and optimize SIP routing, dial plans, and call flows.

- Configure and administer Session Border Controllers (OpenSIPS/Kamailio).

- Deploy, maintain, and troubleshoot FreeSWITCH media servers.

- Support SIP trunk integrations with carriers and third-party providers.

Troubleshooting & Support :

- SIP signaling

- RTP media streams

- Call quality (jitter, latency, packet loss)

- NAT traversal issues

- One-way/no audio problems

- Connectivity and interoperability issues

- Perform SIP trace and packet-level troubleshooting using Wireshark, sngrep, and similar tools.

- Analyze logs and debug signaling/media-related issues.

Routing, High Availability & Optimization :

- Implement Least Cost Routing (LCR) strategies.

- Configure failover, redundancy, and high availability solutions.

- Optimize routing logic and system performance.

- Monitor uptime, voice quality, and infrastructure reliability.

Monitoring & Performance :

- Capacity planning and performance tuning for voice systems.

- Ensure platform stability, scalability, and security.

Collaboration & Documentation :

- Work with network, infrastructure, and development teams for integrations and deployments.

- Document system configurations, dial plans, troubleshooting procedures, and operational runbooks.

- Support production deployments, upgrades, and change management activities.

Required Skills :

- 4 - 8 years of experience in VoIP engineering / SIP infrastructure

Strong expertise in :

- SIP

- RTP

- SBCs

- OpenSIPS or Kamailio

- FreeSWITCH

Experience with :

- SIP routing and dial plans

- NAT traversal

- LCR implementation

- Failover / HA architectures

- Strong Linux administration skills

Good understanding of networking :

- TCP/IP

- UDP

- DNS

- Firewalls

- NAT

Tools & Technologies :

- OpenSIPS / Kamailio

- FreeSWITCH

- Wireshark

- sngrep

- Linux

Good to Have :

- Asterisk

- AWS / Azure

- Python / Bash scripting

- Docker / Kubernetes exposure

- WebRTC knowledge

Preferred Qualifications :

- Exposure to carrier-grade voice systems

- Knowledge of security for SIP/SBC environments

- Experience with scalable real-time communication systems