Phone calls and text messages don’t work when connected to WiFi?

[apparii]

For some reason 5G and 4G devices have failed calls and text messages on my home network. Any setting changes or suggestions?

[Netduma-Fraser]

What router are you using currently?

[apparii]

Using the Nighthawk XR500

[Netduma-Fraser]

Okay so I assume you're using WiFi calling? Are you using Smart Connect? If so disable this and connect to 2.4 or 5GHz manually and then see if it behaves better.

[apparii]

Smart connect is not enabled. Thanks for the idea to check, though. WiFi calling is set up on all devices. Not sure why SMS/MMS messages don’t go through to Android users.

[Netduma-Fraser]

In WAN Settings toggle SIP ALG and see if that helps please.

[apparii]

Unfortunately that did not fix the issue with failed calls.

[Netduma-Fraser]

Okay in the WAN Settings also switch NAT to Open, if that doesn't work then in QoS in the Anti-Bufferbloat menu disable QoS entirely and then try please.

[apparii]

Changing to Open didn't improve texts. I'm pretty confident disabling QoS has improved texts going through from iPhone to Android. I will check back if I still have issues. If I don't, that's what fixed it.

[apparii]

There seem to be fewer errors, but they still occur, unfortunately; both failed calls and unsent SMS messages. This occurs on iPhone 12 Pro and Mini, specifically.

[Netduma-Fraser]

I'd suggest upgrading to the beta and doing a factory reset. If it then still occurs then make a Traffic Controller rule to allow ALL traffic to those devices https://community.netgear.com/t5/Nighthawk-Pro-Gaming-DumaOS-3-0/bd-p/en-home-beta-npg-duma

Actually before that you could make a manual Traffic Prioritization rule for the devices 1-65535 Source/Destination TCP/UDP and see if that works.

[apparii]

Traffic prioritization rules and beta firmware didn't fix the problem.

My ISP and modem are running fine. Over the past month I spent many hours working with Verizon who said it's likely a problem with iPhone 12's and it'd be fixed with the iOS update on 1/25 (14.4), but it didn't solve the issue. I called and spoke with Apple on Friday and they said it isn't a known issue with their devices, but because we have AppleCare they still wanted to check out the phone statistics and diagnostics in person. So, I spent 4 hours today backing up our new phones, taking them to the Apple Store a half hour away, getting replacement phones, and then restoring them from backup. It did not solve the problem. So, it is not our phones. I'm really frustrated.

[Netduma-Liam]

Thanks for the update. 

So if you connect to your old ISP router, you don't experience this issue?