By default, you don't need to change your network settings. If special settings are used in your network or in VIPole Enterprise, get them from the system administrator. In particular, you can specify the range of local UDP ports that the program will use for audio and video communication on your device. In case the values are zero, the ports are selected automatically from the entire available range.
Main menu > Options Network > Server settings/ UDP port range for voice and video calls/proxy settings.
More > Settings > Connection options > Server/Proxy/UDP port range for calls.
Main menu > Options > Connection options > Server/Proxy/UDP port range for calls.