RBK752 - Awesome but disconnects on facetime a lot

mnichollsuk917 

OK were going to pick this back up here as we need to confirm what your ISP Modem (EE Smart Hub) Is doing and what it is. 

Is your actual modem/router seen here? 

https://www.eehomebroadband.com

We need the model # information of the modem of the sticker please. 

So I just got off of a 15 minute facetime call to a Orbi 50 series user while my iPhone 12 Pro Max iOS 15.3 was connected to the RBR850 thats connected to a CAX80 in modem only mode. (Single NAT) Orbi 8 series on v5 FW. Using manual channes 11 and 48. 25% power on the RBR. I have two wifi systems i'm try to keep from creating too much noise. CTS at default of 64. SIP ALG disabled. AX enabled on both frequencies. 

I kept checking the phone for signal change or anything odd. Not one event was seen nor did the phone change from wifi to cell during the call. No dropped call during the entire call. 

Were thinking that your ISP Modem maybe playing a roll in what your seeing and we need to determine if the modem does have a built in router and if it's active while the RBR is online and also working in router mode. If your ISP Modem already has a built in router and wifi. This would be a double NAT (two router) condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT
https://kb.netgear.com/30187/How-to-fix-issues-with-Double-NAT
Couple of options,
1. Configure the modem for transparent bridge or modem only mode. Then use the Orbi router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the Orbi router gets from the modem. Then you can use the Orbi router in Router mode.
3. Or disable all wifi radios on the modem and connect the Orbi router to the modem, configure AP mode on the Orbi router. https://kb.netgear.com/31218/How-do-I-configure-my-Orbi-router-to-act-as-an-access-point and https://www.youtube.com/watch?v=H7LOcJ8GdDo&app=desktop