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VoIP infrastructure foundation

In production

Infrastructure / telephony engineer · Superfone · 2021 – 2024

Standing up the telephony backbone — Asterisk for media, Kamailio as the SIP edge, RTPEngine for media relay — from first deployment to a multi-datacenter, multi-carrier setup.

SIP / VoIP · Asterisk · Kamailio · RTPEngine · Prometheus · Infrastructure

rtpengine-stats-exporter ↗ Kamailio-Config-Formatter ↗

Before any of the product existed, someone had to make a call actually connect. Starting in 2021, that was me: configuring and operating the raw telephony layer that everything else sits on top of. This is the unfashionable, load-bearing end of VoIP.

What I built and ran

  • Asterisk — dialplans, call-flow scripting, and the integrations that turn a media server into a product, from first deployment through to scale.

  • Kamailio as the session-border layer — SIP proxy configuration for both carrier-side trunk termination and client-side registration, including routing, failover, and load balancing across data centers.

  • RTPEngine for media relay — deployed, tuned, and monitored. I built a small open-source Prometheus exporter for its stats so we could actually see what the media plane was doing.

  • The edge, hardened — brute-force protection on the SIP ports, call-quality inspection, and load testing before changes went near production.

  • Tooling from the trenches — I got tired of editing huge Kamailio configs with no editor support, so I published a config formatter for them.

The through-line: this layer is judged by a single brutal metric — did the call connect, and did it sound clean? Everything else is downstream of getting that right.