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I have recently purchased a TP-Link Deco Whole Home Mesh WiFi System from Amazon which consists of 3 Deco M5 devices. I followed the instructions on how to set it up by first removing my existing home router and powering off my cable modem. I connected one of the M5 devices to the modem, then powered both on. The set up went very smooth and soon I had all three M5 devices connected using the Deco app on my android phone. Speed tests were great and everything seemed to work fine. I then noticed my VOIP phone to my office was in a disconnected state. I rebooted the phone and it still wouldn't connect. I set up an access rule in the Router M5 to allow port 5060 to the phone but it still wouldn't connect. I then turned off the security features (antivirus, content filtering, parental controls) and still it would not connect.

I changed the operating mode of the M5 to Access Point and put my home router back in the network. That fixed the VOIP issue. Keep in mind that my VOIP phone is wired with an ethernet cable to my router. When I was using the M5 in Router mode, I had a gigabit switch connected to the second M5 router ethernet port because I need more than just one ethernet port for my wired devices.

Why is my VOIP phone not connecting? With my rule in place to pass port 5060 traffic to the IP of the phone, it should work. Regardless of having a rule in place, outbound connections should be trusted and passed regardless, right? I would really like to utilize all of the functionality that I get by setting the M5 to work in Router mode, but my VOIP phone must work. Any ideas?