Engineering Resilient Apps and Cloud Infrastructurehttps://andrius.mobi/https://andrius.mobi/2023/07/register-sip-account-and-receive-calls-with-twilio.htmlhttps://andrius.mobi/2023/07/register-sip-account-and-receive-calls-with-twilio.htmlHow to register your SIP softphone and receive inbound calls using TwilioSat, 08 Jul 2023 13:35:00 GMThttps://andrius.mobi/2019/11/properly-terminate-crystal-lang-service-in-docker.htmlhttps://andrius.mobi/2019/11/properly-terminate-crystal-lang-service-in-docker.htmlHow to handle signals and properly terminate docker service written with the Crystal-lang.Sun, 03 Nov 2019 00:00:00 GMThttps://andrius.mobi/2019/10/create-the-smallest-crystal-lang-docker-image-based-on-scratch.htmlhttps://andrius.mobi/2019/10/create-the-smallest-crystal-lang-docker-image-based-on-scratch.htmlHow to use docker multi-stage builds to create a smallest by size Crystal-lang docker image.Fri, 25 Oct 2019 00:00:00 GMThttps://andrius.mobi/2019/10/all-in-one-asterisk-with-crystal.htmlhttps://andrius.mobi/2019/10/all-in-one-asterisk-with-crystal.htmlI've created and open-sourced a Crystal-lang shard (library) that handles all Asterisk PBX interfaces (ARI, AMI, and all types of AGI).Wed, 23 Oct 2019 00:00:00 GMThttps://andrius.mobi/2018/12/how-to-install-software-on-firewalled-server.htmlhttps://andrius.mobi/2018/12/how-to-install-software-on-firewalled-server.htmlHow to use a reverse SSH proxy to install software on a server with outbound firewalls (gray zone ;) )Thu, 27 Dec 2018 00:00:00 GMThttps://andrius.mobi/2018/12/digital-ocean-floating-ip-and-voip.htmlhttps://andrius.mobi/2018/12/digital-ocean-floating-ip-and-voip.htmlHow to configure DigitalOcean's floating IP with VoIP, specifically with Asterisk, using Docker.Tue, 18 Dec 2018 00:00:00 GMThttps://andrius.mobi/2018/12/tiny-docker-image-with-ngrok.htmlhttps://andrius.mobi/2018/12/tiny-docker-image-with-ngrok.htmlI've found an excellent tiny Docker image for ngrok (wernight/ngrok). From now just using it to handle this blog.Mon, 17 Dec 2018 00:00:00 GMThttps://andrius.mobi/2014/08/asterisk-opus-patch-for-11110.htmlhttps://andrius.mobi/2014/08/asterisk-opus-patch-for-11110.htmlUpdated OPUS codec patch now supports Asterisk 11.11.0 and 12.2.5, tested with VP8 pass-through.Fri, 08 Aug 2014 10:07:00 GMThttps://andrius.mobi/2013/07/webrtc-with-asterisk-11.htmlhttps://andrius.mobi/2013/07/webrtc-with-asterisk-11.htmlTonight, 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.Thu, 11 Jul 2013 11:38:00 GMThttps://andrius.mobi/2013/05/roaming-pbx-update.htmlhttps://andrius.mobi/2013/05/roaming-pbx-update.htmlWhat's new: Asterisk 11.4, SILK codec, watchdog to improve Raspberry Pi board performance and prevent deadlocks.Thu, 23 May 2013 23:30:00 GMThttps://andrius.mobi/2013/05/roaming-pbx-first-release.htmlhttps://andrius.mobi/2013/05/roaming-pbx-first-release.htmlAnnouncing the first alpha release of the Roaming PBX image, featuring Ruby, pcapsipdump, Asterisk PBX, and the SILK codec.Tue, 07 May 2013 21:32:00 GMThttps://andrius.mobi/2013/04/creating-own-image-for-raspberry-pi.htmlhttps://andrius.mobi/2013/04/creating-own-image-for-raspberry-pi.htmlHow to cross-compile a custom Raspberry Pi image and to build custom Asterisk PBX installation.Thu, 25 Apr 2013 21:59:00 GMThttps://andrius.mobi/2013/04/perfect-results-sip-tcp-vs-udp.htmlhttps://andrius.mobi/2013/04/perfect-results-sip-tcp-vs-udp.htmlSwitching a mobile SIP client from UDP to TCP dramatically improved battery life with no noticeable change in voice quality.Tue, 02 Apr 2013 12:24:00 GMThttps://andrius.mobi/2013/03/raspberry-pi-how-to-create-own-image.htmlhttps://andrius.mobi/2013/03/raspberry-pi-how-to-create-own-image.htmlCurrently 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.Fri, 22 Mar 2013 08:24:00 GMThttps://andrius.mobi/2013/03/asterisk-with-silk8-and-amr-nb-codecs.htmlhttps://andrius.mobi/2013/03/asterisk-with-silk8-and-amr-nb-codecs.htmlHow to get Asterisk PBX working with SILK and AMR-NB codecs.Mon, 18 Mar 2013 23:11:00 GMThttps://andrius.mobi/2013/03/debian-installer-asterisk-and-agi.htmlhttps://andrius.mobi/2013/03/debian-installer-asterisk-and-agi.htmlHere is a script that installs Asterisk PBX 11.x: with fax support, MySQL, Ruby, and Adhearsion AGI.Thu, 14 Mar 2013 23:23:00 GMThttps://andrius.mobi/2013/03/roaming-solution-based-on-raspberry-pi-asterisk-chan_dongle.htmlhttps://andrius.mobi/2013/03/roaming-solution-based-on-raspberry-pi-asterisk-chan_dongle.htmlAs 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.Tue, 12 Mar 2013 21:28:00 GMThttps://andrius.mobi/2013/03/why-create-agi.htmlhttps://andrius.mobi/2013/03/why-create-agi.htmlIn 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.Tue, 12 Mar 2013 21:07:00 GMThttps://andrius.mobi/2013/03/your-own-click-to-call-with-asterisk.htmlhttps://andrius.mobi/2013/03/your-own-click-to-call-with-asterisk.htmlSharing one of my older projects with Asterisk: a click-to-call library with client and server components. It does work with Windows!Sun, 10 Mar 2013 12:23:00 GMThttps://andrius.mobi/2013/03/how-to-unlock-huawei-modem.htmlhttps://andrius.mobi/2013/03/how-to-unlock-huawei-modem.htmlAfter 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.Sat, 09 Mar 2013 21:12:00 GMThttps://andrius.mobi/2013/03/asterisk-on-raspberry-pi-as-gsm-gateway.htmlhttps://andrius.mobi/2013/03/asterisk-on-raspberry-pi-as-gsm-gateway.htmlYesterday, 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.Tue, 05 Mar 2013 19:50:00 GMThttps://andrius.mobi/2013/02/time-based-conditions-in-agi-application.htmlhttps://andrius.mobi/2013/02/time-based-conditions-in-agi-application.htmlThe typical telephony system processes incoming call flows based on different times. Customers want to have control over this and handle time ranges. The platform can also be a multi-tenant server with different virtual PBXes. In my implementation, I use Ruby, ActiveRecord, and polymorphic associations to create routing blocks. By reusing polymorphic database associations, I can create flexible call flow building blocks. These blocks can be linked to any voice-related entity in a PBX, such as an extension, voicemail, conference, etc. This enables customizable and dynamic call handling based on time conditions.Fri, 22 Feb 2013 22:54:00 GMThttps://andrius.mobi/2013/02/delete-voice-recordings-older-than-n-days.htmlhttps://andrius.mobi/2013/02/delete-voice-recordings-older-than-n-days.htmlDisk space running out fast in loaded telephony systems with instant call recording or either with heavy usage of voicemail. It's good to purge them on regular basis.Fri, 22 Feb 2013 09:30:00 GMThttps://andrius.mobi/2013/02/questionnaire-with-asterisk-pbx-agi-ruby.htmlhttps://andrius.mobi/2013/02/questionnaire-with-asterisk-pbx-agi-ruby.htmlThe Questionnaire application, based on the AsteriskRuby gem, is a production-ready system that was developed a while ago for a small project. Now, I want to share it with the VoIP community. The application provides caller authentication, prompts for a PIN code, and continues from the last unanswered question for returning callers, storing answers and call records in the database.Tue, 12 Feb 2013 22:29:00 GMThttps://andrius.mobi/2013/02/telephony-system-for-remote-locations.htmlhttps://andrius.mobi/2013/02/telephony-system-for-remote-locations.htmlHow 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.Tue, 05 Feb 2013 22:00:00 GMThttps://andrius.mobi/2013/02/asterisk-agi-sample-in-bash.htmlhttps://andrius.mobi/2013/02/asterisk-agi-sample-in-bash.htmlThe Asterisk PBX AGI sample in Bash is a great option for creating small yet flexible dial plans for embedded devices and more.Sat, 02 Feb 2013 20:29:00 GMT