https://blog.sparktour.me/en/tags/android/ Recent content in Android on Sparktour’s Blog https://assets.sparktour.me/img/blog/misc/about-bg.jpg https://assets.sparktour.me/img/blog/misc/about-bg.jpg Hugo en Mon, 14 Sep 2026 22:49:27 -0700 https://blog.sparktour.me/en/posts/2026/09/14/self-hosted-sip-push-flexisip-linphone-android/ Mon, 14 Sep 2026 12:00:00 +0000 https://blog.sparktour.me/en/posts/2026/09/14/self-hosted-sip-push-flexisip-linphone-android/ <p>Back in 2022, I wrote a post about <a href="https://blog.sparktour.me/en/posts/2022/10/08/quectel-ec20-asterisk-freepbx-gsm-gateway/">using an EC20 module with Asterisk and FreePBX for SMS forwarding and VoIP</a>. The setup could already route calls from the SIM card in the EC20 to a SIP client, but the post ended with one fairly serious usability issue: the SIP client on my phone had to stay running. Otherwise, incoming calls could not reach the client, and the caller would hear a busy tone. At the time, the only easy solution I found was Zoiper Push Proxy, which was not free.</p>