Wifi Calling calls drop with SW/HW Flow Offloading Enabled

Hostname	OpenWrt
Model	Ubiquiti EdgeRouter X
Architecture	MediaTek MT7621 ver:1 eco:3
Target Platform	ramips/mt7621
Firmware Version	OpenWrt 22.03.0 r19685-512e76967f / LuCI openwrt-22.03 branch git-22.245.77528-487e58a
Kernel Version	5.10.138
Uptime	10h 48m 17s
Load Average	0.02, 0.03, 0.00

iOS 16 RC (also happens on iOS 15)
Network: Eir network in Ireland
Access Points: Cisco Aironet 1850 series (which i fully reset also)

When moving from one AP in my house to another, while using Wi-Fi Calling on iPhone 11 Pro, the call drops, but only when i have SW/HW Flow offloading enabled. When I disable it, the call does not get dropped.

I can reproduce each time i try. Any help with troubleshooting is appreciated!


I do not know which WIfi protocols you are using, but it seems some settings are not fully compatible with eachother.
Does the Ubiquiti EdgeRouter can use this SW/HW offloading? If you also use QoS/SQM, it is NOT fully compatible.
If it works better with this option off, why don't you leave it off?


I can confirm that the ER-X has issues at least with HW offloading. I recently upgraded one to 22.03.0 that's on a 50/5 line and it would drop below that with HW offloading on.

There was no difference with SW offloading on/off as I couldn't max out the router so I'm not sure about SW offloading yet.