- /e/OS version: 3.3-a14-20251214557450-community-z3s - Device model(s): Samsung G20 Ultra - Impacted Application: Linphone, Zadarma (and all other SIP apps) - Affected application/URL: Linphone - Browser/client and version: Vivaldiv 7.7 ## The problem I have a virtual mobile number (+4679140 ...) from voipvoip.com which I would like to use via SIP using the official VoipVoip app, called ZADARMA, and alternatively LINPHONE. The problem is that I can call out, but when I call in 1) the phone/app does not ring at all or 2) after a long delay of 20-30sec the phone starts ringing, but no notification window is shown, so I cannot "pick up"/accept the call. I think the problem is related to ZADARMA/LINPHONE using Google Mobile Services (Firebase Cloud Messaging) which is not available in microG services. Any advice how to make this work? Steps to reproduce 1) get a mobile phone number from voipvoip.com 2) download and configure linphone 3) call mobile phone number from another mobile phone using standard mobile network ## Technical details **Paste any relevant logs (`adb logcat`) in the codeblock below if you have any** ``` no logs available ``` <!--Add the labels corresponding to your issue by adding a tilde and typing the name of the label you think apply to your issue in the line above. You need to type a tilde before the name of each label you want to apply to the issue.-->