Hello frankmundo

                             SB8200 is just a cable modem, so you will be using separate router connected to the modem to access Wi-Fi.

                              To improve Wi-Fi calling you need to have better Wi-Fi signal from the router so, to check and adjust the Wi-Fi signal, you need to access router interface/GUI.

                              For changing or correcting Wi-Fi channels you can contact the router manufacturer or login to the router GUI.

Okay I use an Orbi system throughout the house. I will call Netgear then and see if they can help me. Thank you