@MR.S Controller is on latest 1.29.7 now. Issue persists.

@MR.S Router is at 2.3.0 The controller was on 1.26.6, which seems to be outdated. I never see this update because the controller is only accessible in Global View, which I never use. Upgrade is in...

@MR.S An ER605 v2.0

When I set a fixed IP sdress within the config page of a client, the settings will never change the current IP adress of the device. Even if I replug the ethernet cable and reboot the client, the...

@Clive_A To make it clear: There is no phone system I could tell you anything about. VoWiFi is a feature used by a mobile phone / cell phone / smartphone.

OMG, you are talking about VoIP (Voice over IP) using SIP. This has nothing to do with VoWiFi / WiFi Calling / WLAN Calling. These are two compeletely different topics. VoWiFi does NOT use plain SIP...