Call Machine

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Features

• Answers calls automatically with custom greeting audio.
• Offers to limit single message duration to prevent one caller from hoggin the phone line.
• Country code whitelisting - to prevent calls from other countries being automatically answered and costing you money
• Saving recorded messages on SD card or Internal storage and even in app's private directory in /data partition
• Can upload messages to a self-hosted WetRadio instance.

If you desire the app to include contact name in file names of recorded messages, please manually grant contacts permission in settings.

Warning:

This has only been tested on Xiaomi Redmi Note 8T running LineageOS 23.2 (Android 16)

It may or may not work on other devices/ROMs.

The application has zero dependencies

Supported audio codecs

Codec	Containers	File extension
Opus	ogg, mp4, webm	.ogg, .m4a, .wemb
AAC-LC	mp4, adts	.m4a, .aac
HE-AAC v2	mp4, adts	.m4a, .aac
AMR Wideband	amr, 3gpp	.amr, .3gpp
AMR Narrowband	amr, 3gpp	.amr, .3gpp

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Compile from source

The app itself can be compiled using Android Studio just like any other android application. It can also be compiled with Gradle from command line:

./gradlew :app:build

When you're done compiling move the apk from app/build/outputs/apk/debug/ to MagiskModule/system/priv-app/CallMachine/ and rename it to CallMachine.apk.

Now go to MagiskModule/ and ZIP META-INF, system and module.prop together. Make sure not to create a parent directory inside the ZIP archive. These three items should be in the root of the ZIP file, otherwise Magisk is going to reject the module.

Note: Binary files inside MagiskModule/system/bin were obtained from here.