I was unsure about ordering this and it's compatibility. I have 5 Gigaset phones to connect to it, I didn't have any concerns about these working. The part I was concerned with was that I'm running an Asterisk server as my PBX to 6 corded IP phones, however the N300 connected to the network and setting up extensions for all the phones was easy, and it just worked and has done for the last couple of months.