Problems with bluetooth connection Fairphone 3 -> Renault R-Link2

Summary

When connection to the Renault R-Link2 system in my car, the bluetooth connection is established without any problem. However, after a few seconds the message "phone has no network" appears on the screen of the R-Link system (even if my phone has perfect network connection). The result is that I cannot use the R-Link2 system to start a phone call, but when a call is initiated directly from my phone, or when I receive an incoming call, everything works fine (proving that the bluetooth connection for calls still works). Whether other bluetooth connections (such as a media connection for playing back music) are active does not seem to make a difference.

The problem

To reproduce, buy or rent a Renault with an R-Link2 system and establish a bluetooth connection. Then try to make a phonecall using the R-Link system.

What is the current behavior? A few seconds after establishing the bluetooth phone connection, the R-Link2 system shows a message "phone has no network"

What is the expected correct behavior? That I can use the R-Link2 system to initiate phone calls.

Technical informations

Relevant logs (adb logcat) No logs available

Relevant screenshots No relevant screenshots

Solutions

Workaround Initiate calls directly from my phone (which requires picking up my phone, which is unsafe and illegal when driving)

Possible fixes No suggestions.