voip

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.

Notes on integrating Asterisk 23's chan_websocket channel driver with Pipecat. Three attempts, the protocol surprises, and the small bridge code that ended up working end-to-end.

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.

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

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

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.

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

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.

How to build a telecommunication system to keep you connected globally while maintaining a good price/quality/flexibility balance. The components include a VoIP server, prepaid SIM card, and DID phone number for low-cost or zero-cost calls.