It possible depending of the device. It something you should see with the devices manufacturer support and maybe some can help if it’s a well know model.
Hi,
There can be multiple WAN nodes with the same WANConnectionDevice device node. You can try to create another PPPoE WAN and enable both IPoE and PPPoE WAN simultaneously. If you have the IPoE WAN for the Voice service and configure the IP domain and routing correctly. Your voice service should go through the IPoE interface. Or you may have the WANConnectionDevice.1 for the PPPoE service and the WANConnectionDevice.2 for the IPoE service.