Default Talk in Silent

Finally have a found the real reason. When Talk is set to:

Notification: System Bar;
Sound: Silent.

When a message comes and the chat is in foreground, the volume is changed to level 3.

The program I've made, once started, poles the sound level each 5 seconds and when it's different a notification appears.

To this post I've attached the .apk, its source and a silent ringtone to overcome this bug.
Attached Files
File Type: zip VolumeChangeNotifyExported.zip - [Click for QR Code] (16.7 KB, 5 views)
File Type: apk Volume Change Notifier.apk - [Click for QR Code] (16.0 KB, 8 views)
File Type: zip null.zip - [Click for QR Code] (3.1 KB, 15 views)