The app allows to make and receive phone calls from your landline number which is configured as VoIP/SIP account in the Fritzbox router (basically to use the smartphone as landline phone).
Initially, it seems to work with Adguard enabled because incoming calls are signaled and you can both answer and start a call.
But then no audio is transmitted. It shows no error and both caller and receiver act as if the connection is properly established, but it is just dead silent on both ends.
Filter protocol does not show any blocked connections. It is neither sufficient to exclude the app from filtering nor to exclude it from being routed through Adguard local VPN.
Only way to get any audio transmitted is to completely disable Adguard. Any ideas why that could be?
Issue URL (Incorrect Blocking)
https://play.google.com/store/apps/details?id=de.avm.android.fritzapp
Comment
Username: @tox1c90
Screenshots
Screenshot 1
![Screenshot 1](https://reports-img.adguard.com/sRDazSE.png)Screenshot 2
![Screenshot 2](https://reports-img.adguard.com/F3YMUTO.png)System configuration
AdGuard Base,
AdGuard Mobile Ads
Privacy:
AdGuard Tracking Protection
Social Widgets:
AdGuard Social Media
Annoyances:
AdGuard Annoyances
Other:
AdGuard Experimental
Language-specific:
AdGuard German
https://userscripts.adtidy.org/release/adguard-extra/1.0/adguard-extra.meta.js