Question about TP-Link TL-PA4010 Kit

The TL-PA4010 kit and the Cisco IP Phone 8851 each have an Ethernet connection. They are "compatible" in that you can connect them with a patch cable. If it works the same - great! If not, this does not necessarily mean a "compatibility problem", because the configuration of a network with VoIP devices requires at most some background knowledge (prioritisation of VoIP packets with QoS, VLAN).