hi! I changed to the TCP but it still doesn't sounds when I have incoming calls in background. only banner. how i can fix it?
Please open your iPhone "Settings" menu, then go to "Notifications" and check whether all the notifications are enabled for Zoiper. You might need also to open Zoiper and to increase the volume by using the side buttons of the device.
I understood the reason. it doesnt work if i choose the ringtone "sail". you can test it.