Blog

I'm returning to Crystal-lang. The existing Vim and Neovim plugins are outdated, so I have authored my own: a complete tree-sitter-based plugin for Neovim 0.11+, built end-to-end with Claude Code in one afternoon.

How I migrated andrius.mobi from Jekyll to Astro 5 in a week, using Claude as a pair programmer for content migration, dark mode, performance work, and Firebase auth.

Notes on rebuilding andrius/asterisk. The template system, the version coverage from 1.2.40 to 23.2.0, and the CI/CD that keeps it supported.

Open-sourced run-in-docker, a small GitHub Action that runs build commands inside a legacy Debian container without forcing Node.js into the container itself.

A self-hosted Coder running on a tiny Scaleway Stardust, spinning up ephemeral Hetzner workspaces from Packer-built snapshots, with a persistent volume for /home and Tailscale for reach.

Notes on building CI for services that still ship on Debian Jessie and Stretch. The image stack, the Node.js compatibility problem, and the workarounds that keep actions/checkout running on glibc that is older than GitHub expects.

A year after migrating an R&D team's repositories to GitHub, the per-repo workflows had drifted into a maintenance problem. Notes on consolidating around fifty repositories behind a small set of reusable workflows.

How to register your SIP softphone and receive inbound calls using Twilio

Notes on moving an R&D team's repositories from a self-hosted GitLab installation to GitHub. The migration tool, the per-repo CI, and the design choices that came out of it.

Notes on the telephony layer of a conference-bridge platform built with a small team. FreeSWITCH in Docker, SIP plus WebRTC, a dialplan that curls into the API on every call, and a recording pipeline driven by post-process hooks.

How to handle signals and properly terminate docker service written with the Crystal-lang.

How to use docker multi-stage builds to create a smallest by size Crystal-lang docker image.

I've created and open-sourced a Crystal-lang shard (library) that handles all Asterisk PBX interfaces (ARI, AMI, and all types of AGI).

How to use a reverse SSH proxy to install software on a server with outbound firewalls (gray zone ;) )

How to configure DigitalOcean's floating IP with VoIP, specifically with Asterisk, using Docker.

I've found an excellent tiny Docker image for ngrok (wernight/ngrok). From now just using it to handle this blog.

Updated OPUS codec patch now supports Asterisk 11.11.0 and 12.2.5, tested with VP8 pass-through.

Tonight, I tried two WebRTC clients (JsSIP and sipML5) with Asterisk 11. I was able to get both of them working for echo test calls with the ulaw (g711u) codec. However, when I called from WebRTC to the SIP softphone, there was only one-way audio.

What's new: Asterisk 11.4, SILK codec, watchdog to improve Raspberry Pi board performance and prevent deadlocks.

Announcing the first alpha release of the Roaming PBX image, featuring Ruby, pcapsipdump, Asterisk PBX, and the SILK codec.

How to cross-compile a custom Raspberry Pi image and to build custom Asterisk PBX installation.

Switching a mobile SIP client from UDP to TCP dramatically improved battery life with no noticeable change in voice quality.

Currently I do developing my own Roaming VoIP PBX as a Raspberry Pi image, and have to rebuild project packages often. It is not best idea to compile packages right on Raspberry Pi. That would take hours. I was searching for a tool that can create image base - on my laptop or VPS.

How to get Asterisk PBX working with SILK and AMR-NB codecs.

Here is a script that installs Asterisk PBX 11.x: with fax support, MySQL, Ruby, and Adhearsion AGI.

As a frequent traveler, I understand the telecommunications needs of other travelers and citizens of the world. Recently, I decided to dedicate my free time to building a Roaming PBX solution.

In the world of Asterisk, the dial-plan is a powerful tool for creating custom voice applications. However, there are situations where using AGI (Asterisk Gateway Interface) is preferred. This article explores the reasons why AGI can be a valuable addition to your Asterisk system.

Sharing one of my older projects with Asterisk: a click-to-call library with client and server components. It does work with Windows!

After my last post about the GSM gateway based on Raspberry Pi and Huawei modem, I received a few questions asking how to unlock it. Below is a YouTube video that describes the process.

Yesterday, I installed chan_dongle for my Asterisk PBX running on Raspberry Pi. chan_dongle is a driver that enables the use of Huawei 3G USB dongles as a voice "board" for handling voice, SMS, and USSD. I conducted extensive research on various topics and summarized everything in a document. Additionally, I provided useful links related to Asterisk CLI commands, troubleshooting Huawei modems, and additional resources for chan_dongle.